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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Acquisition and maturation of oral microbiome throughout childhood: An update</title><author><name sortKey="Sampaio Maia, Benedita" sort="Sampaio Maia, Benedita" uniqKey="Sampaio Maia B" first="Benedita" last="Sampaio-Maia">Benedita Sampaio-Maia</name><affiliation><nlm:aff id="aff1">Department of Microbiology, Faculty of Dental Medicine, University of Porto, Porto, Portugal</nlm:aff></affiliation></author><author><name sortKey="Monteiro Silva, Filipa" sort="Monteiro Silva, Filipa" uniqKey="Monteiro Silva F" first="Filipa" last="Monteiro-Silva">Filipa Monteiro-Silva</name><affiliation><nlm:aff id="aff1">Department of Microbiology, Faculty of Dental Medicine, University of Porto, Porto, Portugal</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25097637</idno><idno type="pmc">4119360</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119360</idno><idno type="RBID">PMC:4119360</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000806</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000806</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Acquisition and maturation of oral microbiome throughout childhood: An update</title><author><name sortKey="Sampaio Maia, Benedita" sort="Sampaio Maia, Benedita" uniqKey="Sampaio Maia B" first="Benedita" last="Sampaio-Maia">Benedita Sampaio-Maia</name><affiliation><nlm:aff id="aff1">Department of Microbiology, Faculty of Dental Medicine, University of Porto, Porto, Portugal</nlm:aff></affiliation></author><author><name sortKey="Monteiro Silva, Filipa" sort="Monteiro Silva, Filipa" uniqKey="Monteiro Silva F" first="Filipa" last="Monteiro-Silva">Filipa Monteiro-Silva</name><affiliation><nlm:aff id="aff1">Department of Microbiology, Faculty of Dental Medicine, University of Porto, Porto, Portugal</nlm:aff></affiliation></author></analytic><series><title level="j">Dental Research Journal</title><idno type="ISSN">1735-3327</idno><idno type="eISSN">2008-0255</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Traditional microbiology concepts are being renewed since the development of new microbiological technologies, such as, sequencing and large-scale genome analysis. Since the entry into the new millennium, a lot of new information has emerged regarding the oral microbiome. This revision presents an overview of this renewed knowledge on oral microbial community acquisition in the newborn and on the evolution of this microbiome to adulthood. Throughout childhood, the oral microbial load increases, but the microbial diversity decreases. The initial colonizers are related to the type of delivery, personal relationships, and living environment. These first colonizers seem to condition the subsequent colonization, which will lead to more complex and stable ecosystems in adulthood. These early oral microbial communities, therefore, play a major role in the development of the adult oral microbiota and may represent a source of both pathogenic and protective microorganisms in a very early stage of human life. The implications of this knowledge on the daily clinical practice of odontopediatrics are highlighted.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Keijser, Bj" uniqKey="Keijser B">BJ Keijser</name></author><author><name sortKey="Zaura, E" uniqKey="Zaura E">E Zaura</name></author><author><name sortKey="Huse, Sm" uniqKey="Huse S">SM Huse</name></author><author><name sortKey="Van Der Vossen, Jm" uniqKey="Van Der Vossen J">JM van der Vossen</name></author><author><name sortKey="Schuren, Fh" uniqKey="Schuren F">FH Schuren</name></author><author><name sortKey="Montijn, Rc" uniqKey="Montijn R">RC Montijn</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Ling, Z" uniqKey="Ling Z">Z Ling</name></author><author><name sortKey="Kong, J" uniqKey="Kong J">J Kong</name></author><author><name sortKey="Jia, P" uniqKey="Jia P">P Jia</name></author><author><name sortKey="Wei, C" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Dent Res J (Isfahan)</journal-id><journal-id journal-id-type="iso-abbrev">Dent Res J (Isfahan)</journal-id><journal-id journal-id-type="publisher-id">DRJ</journal-id><journal-title-group><journal-title>Dental Research Journal</journal-title></journal-title-group><issn pub-type="ppub">1735-3327</issn><issn pub-type="epub">2008-0255</issn><publisher><publisher-name>Medknow Publications & Media Pvt Ltd</publisher-name><publisher-loc>India</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25097637</article-id><article-id pub-id-type="pmc">4119360</article-id><article-id pub-id-type="publisher-id">DRJ-11-291</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title>Acquisition and maturation of oral microbiome throughout childhood: An update</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Sampaio-Maia</surname><given-names>Benedita</given-names></name><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="corresp" rid="cor1"></xref></contrib><contrib contrib-type="author"><name><surname>Monteiro-Silva</surname><given-names>Filipa</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib></contrib-group><aff id="aff1"><label>1</label>Department of Microbiology, Faculty of Dental Medicine, University of Porto, Porto, Portugal</aff><author-notes><corresp id="cor1"><bold>Address for correspondence:</bold> Dr. Benedita Sampaio-Maia, Department of Microbiology, Faculty of Dental Medicine, University of Porto, Rua Dr. Manuel Pereira da Silva, 4200-393, Porto, Portugal. E-mail: <email xlink:href="bmaia@fmd.up.pt">bmaia@fmd.up.pt</email></corresp></author-notes><pub-date pub-type="ppub"><season>May-Jun</season><year>2014</year></pub-date><volume>11</volume><issue>3</issue><fpage>291</fpage><lpage>301</lpage><history><date date-type="received"><month>7</month><year>2012</year></date><date date-type="accepted"><month>9</month><year>2013</year></date></history><permissions><copyright-statement>Copyright: © Dental Research Journal</copyright-statement><copyright-year>2014</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p>Traditional microbiology concepts are being renewed since the development of new microbiological technologies, such as, sequencing and large-scale genome analysis. Since the entry into the new millennium, a lot of new information has emerged regarding the oral microbiome. This revision presents an overview of this renewed knowledge on oral microbial community acquisition in the newborn and on the evolution of this microbiome to adulthood. Throughout childhood, the oral microbial load increases, but the microbial diversity decreases. The initial colonizers are related to the type of delivery, personal relationships, and living environment. These first colonizers seem to condition the subsequent colonization, which will lead to more complex and stable ecosystems in adulthood. These early oral microbial communities, therefore, play a major role in the development of the adult oral microbiota and may represent a source of both pathogenic and protective microorganisms in a very early stage of human life. The implications of this knowledge on the daily clinical practice of odontopediatrics are highlighted.</p></abstract><kwd-group><kwd>Oral health</kwd><kwd>Oral microbiome</kwd><kwd>pediatrics</kwd></kwd-group></article-meta></front><body><sec sec-type="intro" id="sec1-1"><title>INTRODUCTION</title><p>The concepts of oral microbiology are in revolution since the entry into the new millennium. This profound change comes in the light of new technologies developed for microbiological analysis such as sequencing and large-scale genome analysis. Prior to this new era, it was thought that the number of microorganisms that colonize the oral cavity was around 700 species; today is thought that it may reach 19,000 phylotypes.[<xref rid="ref1" ref-type="bibr">1</xref>] These recent studies have shown that most oral microorganisms are uncultivable; that the oral microbiome is much more diverse than previously thought; and that oral infections are of a polymicrobial nature.[<xref rid="ref2" ref-type="bibr">2</xref><xref rid="ref3" ref-type="bibr">3</xref><xref rid="ref4" ref-type="bibr">4</xref><xref rid="ref5" ref-type="bibr">5</xref>] The microorganisms residing in the oral cavity, and their inevitable inter-relationships, are essential components in changing the balance between health and disease. Thus, understanding what constitutes microbial communities in health, as opposed to disease, is a crucial goal in studying the microbiology of the human mouth, the portal of entry to both the gastrointestinal and respiratory tracts.[<xref rid="ref6" ref-type="bibr">6</xref><xref rid="ref7" ref-type="bibr">7</xref>] This revision presents an overview of this renewed knowledge on oral microbial community acquisition in the newborn and on the evolution of this microbiome to adulthood.</p><sec id="sec2-1"><title>Intrauterine life and microbial colonization</title><p>At present, the medical community assumes that, in normal conditions, intrauterine fetal development occurs in an aseptic environment. However, recent studies have reported intrauterine environment colonization, specifically the amniotic fluid, by oral microorganisms, in up to 70% of the pregnant women.[<xref rid="ref8" ref-type="bibr">8</xref>] The cultivable microorganism most often found was <italic>Fusobacterium nucleatum</italic>, a species associated with periodontal disease.[<xref rid="ref9" ref-type="bibr">9</xref>] This data further supports the notion that in pregnant women, periodontal disease represents a risk factor for preterm birth and low birth weight babies.[<xref rid="ref10" ref-type="bibr">10</xref>] During pregnancy, the bacteria found in the oral cavity may reach the amniotic fluid via transient bacteremia, especially in the presence of oral diseases such as gingivitis or periodontitis. Thus, oral screening and/or oral treatment should integrate the preconception care and oral health maintenance should be a concern throughout pregnancy.</p></sec><sec id="sec2-2"><title>The oral microbiome — from birth to adulthood</title><p>During and after birth, the newborn comes in contact with a wide variety of microorganisms. Given their state of immune tolerance,[<xref rid="ref11" ref-type="bibr">11</xref>] the newborn may be colonized by this initial inoculation. However, only a subgroup of these microorganisms is able to permanently colonize the subject.[<xref rid="ref12" ref-type="bibr">12</xref>] The set of initial colonizers seems to condition the subsequent colonization, which will lead to more complex and stable ecosystems in adulthood.[<xref rid="ref13" ref-type="bibr">13</xref>] These early microbial communities, therefore, play a major role in the development of the microbiota of the adult body and may represent a source of both pathogenic and protective microorganisms in a very early stage of human life. In the following sections, the evolution of oral bacteria, Archaea, fungi, parasitic, and viral colonization from birth to adulthood, will be described.</p></sec><sec id="sec2-3"><title>Oral bacterial colonization</title><p>A significant number of the first bacteria colonizing the human body are of maternal origin. The type of delivery, eutocic or dystocic, may affect the type of microorganisms that the newborn is first exposed to. Immediately after birth (< five minutes), the bacterial communities present in different habitats of the newborn (oral, nasopharyngeal, skin, and intestines) are very similar to each other.[<xref rid="ref14" ref-type="bibr">14</xref>] However, babies born by vaginal birth have similar bacterial communities to the mother's vaginal bacterial communities; predominantly <italic>Lactobacillus</italic>, <italic>Prevotella</italic>, and <italic>Sneathia</italic> spp., while babies born by Cesarean section (dystocic) have bacterial communities similar to those present in the mother's skin, predominantly <italic>Staphylococcus</italic>, <italic>Corynebacterium</italic>, and <italic>Propionibacterium</italic> spp.[<xref rid="ref14" ref-type="bibr">14</xref>]</p><p>At birth and in the subsequent hours, the baby's mouth will be exposed to a large number of microorganisms by contact with the outside world through breathing, breastfeeding, and contact with parents and medical staff. In the postpartum period, it begins the process of permanent colonization of the oral cavity. When the newborn has only twenty-four hours of life, the establishment of the so-called pioneer microorganisms in the oral cavity has already begun. At this stage, the most frequent colonizers of the oral cavity are Gram-positive cocci, including <italic>Streptococcus</italic> and <italic>Staphylococcus</italic>.[<xref rid="ref15" ref-type="bibr">15</xref><xref rid="ref16" ref-type="bibr">16</xref>]</p><p>The pioneer microorganisms begin to promote the change of the environment through the production and excretion of products of their metabolism, which often potentiate the growth of other species. For example, <italic>Streptococcus salivarius</italic> is most often found in the oral cavity of the newborn, since it has the ability to adhere to epithelial cells. This species produces extracellular polymers from sucrose to which other bacteria such as <italic>Actinomyces</italic> spp., can adhere.[<xref rid="ref15" ref-type="bibr">15</xref>] This process of microbial succession and increasing diversity will result in the eventual formation of a complex and more stable microbial community.</p><p>As the baby grows, the microbial communities also evolve. Around five months of age, infants already show a distinct oral microbiota from the mother, due to environmental exposure that occurs in the first months of life, particularly through the ingestion of food, contact with other adults and children, contact with domestic animals, hygiene habits, and so on.[<xref rid="ref17" ref-type="bibr">17</xref>] This microbiota consists mostly of bacteria, including the six phyla: <italic>Firmicutes</italic>, <italic>Proteobacteria</italic>, <italic>Actinobacteria</italic>, <italic>Bacteroidetes</italic>, <italic>Fusobacteria</italic>, and <italic>Spirochaetes</italic>. The most prevalent genera are <italic>Streptococcus</italic>, <italic>Haemophilus</italic>, <italic>Neisseria</italic>, and <italic>Veillonella</italic>.[<xref rid="ref17" ref-type="bibr">17</xref>] Many of these microorganisms, such as <italic>S. mitis</italic> or <italic>S. oralis</italic>, produce immunoglobulin A (IgA) proteases that specifically degrade the secreted salivary IgA. It is speculated that this feature is an advantage for the survival of these species in an IgA-rich environment, which is secreted from the breast milk.[<xref rid="ref18" ref-type="bibr">18</xref>] Interestingly, in this phase, although the infants show fewer oral microorganisms than their parents, they have a greater microbial diversity.[<xref rid="ref17" ref-type="bibr">17</xref>]</p><p>With the eruption of the first teeth, a new ecological event takes place in the oral environment, with the emergence of new adhesion surfaces. It was thought that some cariogenic <italic>Streptococcus</italic> species, such as <italic>S. mutans</italic>, only began their colonization at this stage, due to the fact that their preferable adhesion surfaces are the teeth. This phase was named by Caufield <italic>et al</italic>. as the, ‘window of infectivity’.[<xref rid="ref19" ref-type="bibr">19</xref>] However, recent studies have demonstrated the presence of this species in edentulous children, suggesting that soft tissues may play the role of a reservoir for oral pathogenic microorganisms.[<xref rid="ref17" ref-type="bibr">17</xref><xref rid="ref20" ref-type="bibr">20</xref>] This highlights the importance of oral hygiene practice in the baby, even before tooth eruption.</p><p>At three years of age, the salivary microbiome is already complex, but its maturation process continues until adulthood.[<xref rid="ref21" ref-type="bibr">21</xref>] The children's oral microbiota varies throughout the development of teeth; deciduous, mixed or permanent dentition. The oral microbiota of children with primary dentition in relation to other groups has a higher prevalence of bacteria belonging to the class <italic>Gammaproteobacteria</italic>, particularly the families of <italic>Pseudomonaceae</italic> (genus <italic>Pseudomonas</italic>), <italic>Moraxellaceae</italic> (genera <italic>Acinetobacter</italic>, <italic>Moraxella</italic>, and <italic>Enhydrobacter</italic>), <italic>Enterobacteriaceae</italic> and <italic>Pasteurellaceae</italic> (genus <italic>Aggregatibacter</italic>).[<xref rid="ref21" ref-type="bibr">21</xref>] As the dentition evolves from deciduous to permanent, the population of the bacteria belonging to the <italic>Veillonellaceae</italic> family (genus <italic>Veillonella</italic> and <italic>Selenomonas</italic>) and the genus <italic>Prevotella</italic> increases, while the bacteria of the <italic>Carnobacteriaceae</italic> family (genus <italic>Granulicatella</italic>) decreases.[<xref rid="ref21" ref-type="bibr">21</xref>]</p><p>The emergence of teeth in the oral habitat leads to a major worldwide health problem, that is, dental caries. According to the Surgeon General's report on oral health in America, published in May 2000, dental caries is the most common chronic childhood disease.[<xref rid="ref22" ref-type="bibr">22</xref>] The Global Oral Data Bank of the World Health Organization (WHO) reports that, at 12 years of age, 70 to 85% of the population has or had carious lesions.[<xref rid="ref23" ref-type="bibr">23</xref>] Recent studies evaluating the oral microbial population in children aged three to twelve years, suggest that the entire population of the tooth-bound bacteria, and not just a small number of specific pathogenic bacteria, influences the development of caries.[<xref rid="ref3" ref-type="bibr">3</xref><xref rid="ref20" ref-type="bibr">20</xref><xref rid="ref24" ref-type="bibr">24</xref><xref rid="ref25" ref-type="bibr">25</xref><xref rid="ref26" ref-type="bibr">26</xref><xref rid="ref27" ref-type="bibr">27</xref>] Aas <italic>et al</italic>.,[<xref rid="ref24" ref-type="bibr">24</xref>] showed that 10% of the children and young adults (aged between two and twenty-one years) with dental caries did not have detectable levels of <italic>S. mutans</italic>, and also suggested the involvement of other bacterial species in the development and progression of dental caries, such as, <italic>Lactobacillus</italic>, <italic>Veillonella</italic>, <italic>Bifidobacterium</italic>, <italic>Propionibacterium</italic>, acidogenic non-mutans <italic>Streptococci</italic> (<italic>S. gordonii</italic>, <italic>S. oralis</italic>, <italic>S. Mitis</italic>, and <italic>S. anginosus</italic>[<xref rid="ref28" ref-type="bibr">28</xref>]), <italic>Actinomyces</italic>, and <italic>Atopobium</italic>, thus revealing the polymicrobial nature of this infectious disease. More specifically, in white-spot lesions, the proportion of <italic>S. mutans</italic> found in the plaque associated with the lesion was often higher than in clinically healthy sites, although still quite low, ranging between 0.001 and 10%.[<xref rid="ref29" ref-type="bibr">29</xref>] The non-mutans, <italic>Streptococci</italic> and <italic>Actinomyces</italic>, represented the major groups of bacteria in the enamel lesions. In fact, it was seen that in the absence of <italic>S. mutans</italic> and <italic>Lactobacillus</italic>, the initial demineralization of the enamel could be induced by the early colonizers alone (<italic>S. sanguinis</italic>, <italic>S. Mitis</italic>, and <italic>S. oralis</italic>).[<xref rid="ref3" ref-type="bibr">3</xref><xref rid="ref30" ref-type="bibr">30</xref><xref rid="ref31" ref-type="bibr">31</xref>] In cavitated lesions reaching the dentin, <italic>S. mutans</italic> constituted about 30% of the total microbiota, indicating that these species were associated with advanced stages of decay. However, S. mutans were less prevalent in the progress area of dental caries, where species of <italic>Lactobacillus</italic>, <italic>Bifidobacterium</italic>, and <italic>Prevotella</italic> prevailed.[<xref rid="ref3" ref-type="bibr">3</xref><xref rid="ref24" ref-type="bibr">24</xref><xref rid="ref30" ref-type="bibr">30</xref><xref rid="ref32" ref-type="bibr">32</xref><xref rid="ref33" ref-type="bibr">33</xref><xref rid="ref34" ref-type="bibr">34</xref><xref rid="ref35" ref-type="bibr">35</xref>] Studies evaluating the microbiota associated with early childhood caries, in particular, found the genera of <italic>Streptococcus</italic>, <italic>Veillonella</italic>, <italic>Actinomyces</italic>, <italic>Propionibacterium</italic>, <italic>Granulicatella</italic>, <italic>Leptotrichia</italic>, <italic>Thiomonas</italic>, <italic>Bifidobacterium</italic>, and <italic>Atopobium</italic>, suggesting that there was not a single pathogen, but a pathogenic population that correlated with the development of early childhood caries. It is worth reinforcing that it is not the genotype of bacteria <italic>per se</italic>, but the phenotype adopted in a particular environment, that is, the acidogenic and aciduric potential of the microorganism, that may induce an environmental shift leading to dental caries.[<xref rid="ref24" ref-type="bibr">24</xref><xref rid="ref36" ref-type="bibr">36</xref><xref rid="ref37" ref-type="bibr">37</xref><xref rid="ref38" ref-type="bibr">38</xref>]</p><p>With regard to health, children's oral cavities have a higher proportion of bacteria from the phyla <italic>Firmicutes</italic> (genus <italic>Streptococcus</italic>, <italic>Veillonella</italic>, <italic>Lactobacillus</italic>, and <italic>Granulicatella</italic>) and <italic>Actinobacteria</italic> (<italic>Rothia</italic> and <italic>Actinomyces</italic> genera), and a smaller proportion of bacteria from the phyla <italic>Bacteroidetes</italic> (genus <italic>Prevotella</italic> and order <italic>Bacteroidales</italic>), <italic>Fusobacteria</italic> (genus <italic>Fusobacterium</italic>), <italic>Spirochaetes</italic>, and candidate division TM7, in comparison to adults.[<xref rid="ref21" ref-type="bibr">21</xref>] Interestingly, as the child grows the proportion of periopathogenic bacteria increase. There is a change in the bacterial population from aerobic or facultative gram-positive cocci to anaerobic fastidious gram-negative bacteria.[<xref rid="ref39" ref-type="bibr">39</xref>]</p><p>Puberty is a time of major hormonal changes, which is accompanied by nutritional enrichment of the oral environment. Commonly, this phenomenon leads to an increase in some groups of oral microorganisms, including gram-negative anaerobes and spirochetes.[<xref rid="ref40" ref-type="bibr">40</xref>] This change in the oral microbiota may be associated with the increased incidence and severity of gingivitis during puberty.[<xref rid="ref41" ref-type="bibr">41</xref>]</p><p>It is also important to note that the oral microbiome may play a role in the development of oral and systemic pathology. For example, the increased consumption of fermentable carbohydrates can induce a change, with the oral microbiota favoring the growth of aciduric and acidogenic species, allowing the development of dental caries, as previously described.[<xref rid="ref30" ref-type="bibr">30</xref>] Also, an association between oral microorganisms and cancer has been suggested relatively recently.[<xref rid="ref42" ref-type="bibr">42</xref><xref rid="ref43" ref-type="bibr">43</xref><xref rid="ref44" ref-type="bibr">44</xref>] The major mechanism associated is hypothesized to be a chronic oral infection-based carcinogenesis, being a subjacent inflammation process and the key feature.[<xref rid="ref45" ref-type="bibr">45</xref><xref rid="ref46" ref-type="bibr">46</xref><xref rid="ref47" ref-type="bibr">47</xref><xref rid="ref48" ref-type="bibr">48</xref>] In accordance, poor oral health and dental care, tooth loss, and a history of periodontitis are considered risk factors for cancer development in the oral cavity or other body sites.[<xref rid="ref49" ref-type="bibr">49</xref><xref rid="ref50" ref-type="bibr">50</xref><xref rid="ref51" ref-type="bibr">51</xref><xref rid="ref52" ref-type="bibr">52</xref><xref rid="ref53" ref-type="bibr">53</xref><xref rid="ref54" ref-type="bibr">54</xref><xref rid="ref55" ref-type="bibr">55</xref><xref rid="ref56" ref-type="bibr">56</xref><xref rid="ref57" ref-type="bibr">57</xref><xref rid="ref58" ref-type="bibr">58</xref><xref rid="ref59" ref-type="bibr">59</xref>] In addition, several oral microorganisms, including the commonly encountered oral <italic>Streptococci</italic> (and yeasts), possess metabolic pathways for the conversion of alcohol to carcinogenic acetaldehyde.[<xref rid="ref60" ref-type="bibr">60</xref><xref rid="ref61" ref-type="bibr">61</xref><xref rid="ref62" ref-type="bibr">62</xref><xref rid="ref63" ref-type="bibr">63</xref><xref rid="ref64" ref-type="bibr">64</xref>] Similarly, smoking also causes an increase in salivary acetaldehyde concentrations, hence adding to the risk related to alcohol,[<xref rid="ref65" ref-type="bibr">65</xref>] thus making the effects of smoking and alcohol consumption on cancer development synergistic.[<xref rid="ref66" ref-type="bibr">66</xref>] Virus, are also recognized etiological agents of cancer; the Human Papilloma Virus (HPV) being of particular relevance in the oral cavity, as mentioned a little later in the text, in the chapter on oral virus colonization.[<xref rid="ref67" ref-type="bibr">67</xref>]</p><p>The placement of intraoral biomaterials, such as dental prostheses or orthodontic appliances, may also induce alterations in the oral microbiome.[<xref rid="ref68" ref-type="bibr">68</xref><xref rid="ref69" ref-type="bibr">69</xref><xref rid="ref70" ref-type="bibr">70</xref>] Nowadays, orthodontic treatment is a frequent procedure in children for correction of malocclusion and for the improvement of mastication, speech, and appearance, as well as for overall health, comfort, and self-esteem.[<xref rid="ref71" ref-type="bibr">71</xref>] However, orthodontic treatment is being associated with a higher risk of caries development or exacerbation of any pre-existing periodontal disease.[<xref rid="ref72" ref-type="bibr">72</xref><xref rid="ref73" ref-type="bibr">73</xref><xref rid="ref74" ref-type="bibr">74</xref><xref rid="ref75" ref-type="bibr">75</xref><xref rid="ref76" ref-type="bibr">76</xref><xref rid="ref77" ref-type="bibr">77</xref><xref rid="ref78" ref-type="bibr">78</xref><xref rid="ref79" ref-type="bibr">79</xref><xref rid="ref80" ref-type="bibr">80</xref>] Fixed and removable orthodontic appliances, namely brackets, bands, and space maintainers, may frequently cause enamel demineralization, gingival inflammation, and increase in periodontal pocket depth.[<xref rid="ref74" ref-type="bibr">74</xref><xref rid="ref76" ref-type="bibr">76</xref><xref rid="ref78" ref-type="bibr">78</xref><xref rid="ref79" ref-type="bibr">79</xref><xref rid="ref81" ref-type="bibr">81</xref><xref rid="ref82" ref-type="bibr">82</xref><xref rid="ref83" ref-type="bibr">83</xref>] These can be explained by the increase in plaque accumulation due to a higher number of plaque-retentive sites and impaired mechanical plaque or food residue removal, as well as, by mechanical or chemical irritation due to exposed cement.[<xref rid="ref83" ref-type="bibr">83</xref><xref rid="ref84" ref-type="bibr">84</xref><xref rid="ref85" ref-type="bibr">85</xref>] Furthermore, it has been observed that the surface physicochemical properties of the orthodontic devices, such as, surface roughness, hydrophobicity, and elemental composition can influence bacterial attachment, plaque retaining capacity, microbial diversity, microorganism interaction, as well as, the biofilm matrix.[<xref rid="ref73" ref-type="bibr">73</xref><xref rid="ref86" ref-type="bibr">86</xref><xref rid="ref87" ref-type="bibr">87</xref><xref rid="ref88" ref-type="bibr">88</xref>] As an example, two recent studies evidenced the virulence modulation of <italic>Streptococcus mutans</italic> and <italic>Candida albicans</italic> biofilms by the metal ions released from orthodontic appliances.[<xref rid="ref89" ref-type="bibr">89</xref><xref rid="ref90" ref-type="bibr">90</xref>]</p><p>Sukontapatipark <italic>et al</italic>.,[<xref rid="ref91" ref-type="bibr">91</xref>] in a time-dependent scanning electron microscopy (SEM) study on dental plaque adjacent to orthodontic brackets showed that the early stage of plaque formation began in the first week after the appliances were placed. Although most studies available do not compare oral microbiota before and after orthodontic treatment, the high concentrations of cariogenic microorganisms in the plaque and saliva of children with orthodontic devices,[<xref rid="ref92" ref-type="bibr">92</xref>] namely <italic>Streptococcus mutans</italic> and <italic>S. sobrinus</italic>,[<xref rid="ref93" ref-type="bibr">93</xref><xref rid="ref94" ref-type="bibr">94</xref>] is being associated with recurrent enamel decalcification and white spot lesion formation in patients treated with fixed orthodontic appliances.[<xref rid="ref95" ref-type="bibr">95</xref><xref rid="ref96" ref-type="bibr">96</xref><xref rid="ref97" ref-type="bibr">97</xref><xref rid="ref98" ref-type="bibr">98</xref>]</p><p>In 2006, Naranjo <italic>et al</italic>.,[<xref rid="ref78" ref-type="bibr">78</xref>] reported an increase in the <italic>Porphyromonas gingivalis</italic>, <italic>Prevotella intermedia</italic>, <italic>Prevotella nigrescens</italic>, <italic>Tannerella forsythia</italic>, and <italic>Fusobacterium</italic> species after bracket placement. In accordance with this, in a recent study by Andrucioli <italic>et al</italic>.,[<xref rid="ref93" ref-type="bibr">93</xref>] using the checkerboard DNA–DNA hybridization technique, the bacterial species of the orange complex (namely <italic>P. intermedia</italic>, <italic>P. melaninogenica</italic>, <italic>P. nigrescens</italic>, <italic>S. noxia</italic>, <italic>F. nucleatum sp nucleatum</italic>, <italic>F. nucleatum sp vincentii</italic>, <italic>F. nucleatum sp polymorphum</italic>, <italic>F. periodonticum</italic>, <italic>Campylobacter gracilis</italic>, <italic>C. rectus</italic>, <italic>C. Showae</italic>, and <italic>C. ochracea</italic>) were the most prevalent on metallic brackets, representing 40% of the total bacterial counts, followed by <italic>Veillonella parvula</italic>, representing 22% of the total bacterial counts. These microorganisms may be associated with the enhanced gingival inflammation observed in these patients. Some studies reported that removable devices show less plaque formation in relation to fixed orthodontic appliances.[<xref rid="ref99" ref-type="bibr">99</xref><xref rid="ref100" ref-type="bibr">100</xref>]</p><p>Considering the wide array of bacterial species found on orthodontic appliances <italic>in vivo</italic>, further studies are needed to guide the establishment of preventive clinical protocols that can be effective in controlling microbial contamination and preventing the development of bacteremias and pathologies, such as dental caries and periodontal disease, during orthodontic treatment.[<xref rid="ref93" ref-type="bibr">93</xref>] Furthermore, oral health education supported by supplementary materials (brochures, paintings, etc.) for both children and parents are strongly recommended.[<xref rid="ref99" ref-type="bibr">99</xref>]</p><p>Furthermore, it is of interest to emphasize that systemic changes in the overall host's health status can also influence the composition of the oral microbiome and the host's oral health.[<xref rid="ref101" ref-type="bibr">101</xref>]</p></sec><sec id="sec2-4"><title>Oral Archaea colonization</title><p>Archaea represent a small minority of the oral microbiome, which are restricted to a small number of methanogenic species/phylotypes, namely, <italic>Methanobrevibacter oralis</italic>, <italic>Methanobacterium curvum</italic>/<italic>congolense</italic>, and <italic>Methanosarcina mazei</italic>.[<xref rid="ref102" ref-type="bibr">102</xref><xref rid="ref103" ref-type="bibr">103</xref>] Archaea can be detected in healthy individuals, but its prevalence seems to increase in subjects with periodontitis. However, studies with these microorganisms are very scarce.</p></sec><sec id="sec2-5"><title>Oral fungal colonization</title><p>The oral cavity of newborns may be colonized by yeasts, specifically <italic>Candida</italic>, on their first day of life; and during the first year, the rate of oral colonization by <italic>Candida</italic> may vary between 40 and 82%.[<xref rid="ref104" ref-type="bibr">104</xref><xref rid="ref105" ref-type="bibr">105</xref><xref rid="ref106" ref-type="bibr">106</xref>] However, in older children the frequency of colonization decreases to values between 3 and 36%.[<xref rid="ref106" ref-type="bibr">106</xref>] These variations in the frequency of oral <italic>Candida</italic> colonization in children may be due to the physiological factors related to age, namely immune maturation, as well as other factors such as environmental changes (hospital vs. home) and diet alterations (breastfeeding vs. formula feeding).[<xref rid="ref104" ref-type="bibr">104</xref><xref rid="ref107" ref-type="bibr">107</xref><xref rid="ref108" ref-type="bibr">108</xref><xref rid="ref109" ref-type="bibr">109</xref>] After infancy, the prevalence of oral <italic>Candida</italic> colonization gradually increases until old age, reaching up to 75% in healthy subjects.[<xref rid="ref106" ref-type="bibr">106</xref><xref rid="ref107" ref-type="bibr">107</xref><xref rid="ref110" ref-type="bibr">110</xref><xref rid="ref111" ref-type="bibr">111</xref>] Although <italic>C. albicans</italic> is the most frequently detected fungi in the oral cavity of healthy children, the species <italic>C. parapsilosis</italic> has also gained some importance.[<xref rid="ref106" ref-type="bibr">106</xref><xref rid="ref107" ref-type="bibr">107</xref><xref rid="ref108" ref-type="bibr">108</xref><xref rid="ref112" ref-type="bibr">112</xref><xref rid="ref113" ref-type="bibr">113</xref>]</p><p>For a long time, yeast <italic>Candida</italic> was the only fungus recognized as part of the normal oral microbial population, despite its opportunistic character.[<xref rid="ref114" ref-type="bibr">114</xref>] However, in 2010, a metagenomic study identified 74 genera of cultivable fungi and 11 uncultivable ones in the oral cavity of healthy adults. Although <italic>Candida</italic> was the most frequent genus isolated in 75% of the subjects, other fungi groups presented a relevant prevalence, such as, <italic>Cladosporium</italic> (65%), <italic>Aureobasidium</italic> (50%), <italic>Saccharomycetales</italic> (50%), <italic>Aspergillus</italic> (35%), <italic>Fusarium</italic> (30%), and <italic>Cryptococcus</italic> (20%). However, the role of this oral mycobiome and its identification in the children's oral cavity is yet to be explored.[<xref rid="ref110" ref-type="bibr">110</xref>] More recently, using improved culture techniques, it was demonstrated that a group of healthy young adults show 100% growth of filamentous fungi in their saliva and 92.5% showed growth of yeast, especially belonging to the genus <italic>Candida</italic>.[<xref rid="ref115" ref-type="bibr">115</xref>] In this study, the most prevalent filamentous fungi identified were <italic>Penicillium</italic> sp., <italic>Aspergillus</italic> sp., and <italic>Cladosporium</italic> sp. Interestingly, the individual profile of fungal colonization was maintained over a six-month period, which might question the assumption that the presence of these fungi in the oral cavity represented only a transient colonization.[<xref rid="ref115" ref-type="bibr">115</xref>] However, the role of this oral ‘mycobiome’ in adults and their identification in the oral cavity of children remains unexploited.</p></sec><sec id="sec2-6"><title>Oral parasitic colonization</title><p>Compared to other groups of microorganisms, few parasites colonize the oral cavity, although several recent studies have revealed that the protozoa are more frequent than previously thought.[<xref rid="ref116" ref-type="bibr">116</xref><xref rid="ref117" ref-type="bibr">117</xref>] Notwithstanding, its prevalence may vary significantly with the worldwide geographic distribution, ranging from 4 to 53%.[<xref rid="ref116" ref-type="bibr">116</xref>] Within oral parasites, the protozoan <italic>Entamoeba gingivalis</italic> and <italic>Trichomonas tenax</italic> are the most frequent and are normally non-pathogenic commensal microorganisms. Although their oral colonization is associated with poor oral hygiene and a low socioeconomic status, these protozoa can also be found in caries-free children and adolescents.[<xref rid="ref117" ref-type="bibr">117</xref><xref rid="ref118" ref-type="bibr">118</xref><xref rid="ref119" ref-type="bibr">119</xref>] The protozoa's rate of colonization increases with age, being more frequent in children aged between 11 and 19 years than in younger children.[<xref rid="ref116" ref-type="bibr">116</xref>] However, protozoa are much more prevalent in adults, particularly in those with periodontal disease.[<xref rid="ref116" ref-type="bibr">116</xref>] It is interesting to note that both protozoa can occur simultaneously, but the rate of colonization of <italic>E. gingivalis</italic> appears to increase more rapidly with age in relation to that of <italic>T. tenax</italic>.[<xref rid="ref119" ref-type="bibr">119</xref>]</p></sec><sec id="sec2-7"><title>Oral viral colonization</title><p>The complexity of the human virome and its relationship with the host's health is not yet completely understood. The recent studies of Pride <italic>et al</italic>.,[<xref rid="ref120" ref-type="bibr">120</xref>] show that there is a persistent community of double-stranded DNA viruses in the saliva of healthy human subjects, almost exclusively identified as bacteriophages. This finding is not surprising, taking into account the massive oral bacterial community. The fact that the vast majority of human oral viruses are bacteriophages, which play a prominent role in lysogeny, suggests that these viruses may play an important role in regulation of the microbial diversity of the human oral cavity.[<xref rid="ref120" ref-type="bibr">120</xref>] However, salivary virus may serve as reservoirs of pathogenic gene function in the human oral environment.[<xref rid="ref120" ref-type="bibr">120</xref>]</p><p>Other viruses associated with human disease may also be found in the oral cavity; however, their presence is primarily viewed as a pathological state. The course of viral diseases in children differs from adults due to the incomplete maturation of the immune system.[<xref rid="ref121" ref-type="bibr">121</xref>] In children, unlike adults, the severity of symptoms is related to the age at which the infection was acquired. Several viral agents can infect oral cells, however, only a few cause clinical alterations. Some examples include: Herpes simplex virus-1 (HSV-1) and HSV-2, which cause herpetic gingivostomatitis, orofacial herpes, and aphthous stomatitis; the Coxsackie A virus, which causes herpangina and hand, foot, and mouth disease; the Morbilli virus that causes measles; the Rubulavirus that causes mumps; and the human papilloma virus that causes oral papilloma (warts).[<xref rid="ref121" ref-type="bibr">121</xref>]</p></sec><sec id="sec2-8"><title>The microbiome on different oral habitats</title><p>The oral microbiome is one of the most complex microbiome of the human body.[<xref rid="ref122" ref-type="bibr">122</xref>] Its complexity results from a variety of oral habitats that comprise the oral cavity. These different oral habitats vary in relation to oxygen tension, nutrient availability, temperature, and host immunological factor exposure, due to their anatomical and physiological characteristics.[<xref rid="ref20" ref-type="bibr">20</xref><xref rid="ref123" ref-type="bibr">123</xref>] Most oral microorganisms colonize all oral habitats, including the mucosa, the tongue, and the teeth, however, their proportion may differ depending on the colonization site. In comparison to the oral mucosa and saliva, the teeth and tongue present a higher microbial load.[<xref rid="ref20" ref-type="bibr">20</xref>]</p><p>With respect to microorganism distribution, the genus <italic>Streptococcus</italic> is present in a high proportion in the soft tissue, saliva, tongue, and supragingival area. The species <italic>S. mitis</italic> and <italic>S. oralis</italic> are found in high proportions in soft tissues, and the species <italic>S. salivarius</italic> is found in greater proportions in the saliva, soft tissues, and tongue.[<xref rid="ref20" ref-type="bibr">20</xref>] Species of the genus <italic>Actinomyces</italic> are detected more frequently in the supra- and subgingival samples. Gram-negative bacilli are found in the subgingival tooth surfaces and also in the tongue fissures. The species <italic>Lactobacillus acidophilus</italic> is found in low proportions in all oral habitats, except in the tongue, where their proportion may be higher. Other bacteria such as <italic>Veillonella parvula</italic> and <italic>Neisseria mucosa</italic>, common colonizers of the oral cavity, are relatively abundant in all oral habitats.[<xref rid="ref20" ref-type="bibr">20</xref>] It should be noted, however, that these proportions may change in case of oral pathology.</p><p>Saliva collects the released microorganisms working as a transition fluid, whereas, the dorsum of the tongue acts as a reservoir for several microorganisms, which will later fill other niches in the sub- and supragingival tooth surfaces.[<xref rid="ref20" ref-type="bibr">20</xref>] In children, the colonization of oral epithelial cells appears to decrease with age,[<xref rid="ref124" ref-type="bibr">124</xref>] perhaps due to improved oral hygiene habits or to the maturation of the immune system, given that during childhood, the levels of secreted IgA increase progressively.[<xref rid="ref125" ref-type="bibr">125</xref>] One of the most dramatic results of the interactions between certain oral bacteria and epithelial cells is the internalization of microorganisms within the host cell. This is an active process, driven by the bacteria, where the signal transduction pathways of epithelial cells, which are otherwise non-phagocytic, are subverted to induce the entry of bacteria.[<xref rid="ref6" ref-type="bibr">6</xref>] Epithelial cells can be infected not only by isolated strains, but also by complex consortia of bacteria, as exemplified by the consortium constituted by <italic>Aggregatibacter actinomycetemcomitans</italic>, <italic>Porphyromonas gingivalis</italic>, and <italic>Tannerella forsythia</italic>.[<xref rid="ref126" ref-type="bibr">126</xref>] The intracellular colonization has several advantages for the microorganisms, including protection against action of the humoral immune system and the action of many antibiotics.</p><p>The discovery that other oral habitats rather than teeth have relevant microbial colonization emphasizes that when the dentist designs a preventive approach he should take into account the oral cavity as a whole.</p></sec><sec id="sec2-9"><title>Routes of transmission of oral microorganisms</title><p>Oral microorganisms may have different origins. Studies that have focused on the phenotypic and genotypic characteristics of oral microorganisms suggest that the mother's or the primary caregiver's oral microbiota represent one of the most important sources of infants’ and young children's oral microbiota.[<xref rid="ref39" ref-type="bibr">39</xref><xref rid="ref127" ref-type="bibr">127</xref><xref rid="ref128" ref-type="bibr">128</xref>] A good example of vertical transmission is the transmission of the mother's vaginal <italic>C. albicans</italic> to ~80% of their vaginally delivered newborns.[<xref rid="ref129" ref-type="bibr">129</xref>] Also, recent studies have shown that breast milk has a specific microbiome that varies throughout lactation.[<xref rid="ref130" ref-type="bibr">130</xref><xref rid="ref131" ref-type="bibr">131</xref><xref rid="ref132" ref-type="bibr">132</xref>] Bacterial communities of milk typically include oral bacteria such as those belonging to the genera <italic>Veillonella</italic>, <italic>Prevotella</italic>, and <italic>Leptotrichia</italic>, suggesting that breastfeeding may represent a significant source of oral microorganisms. Moreover, 30 to 60% of the parents of children colonized with <italic>S. mutans</italic> and <italic>Aggregatibacter actinomycetemcomitans</italic>, important oral pathogens, presented identical bacteria genotypes.[<xref rid="ref133" ref-type="bibr">133</xref><xref rid="ref134" ref-type="bibr">134</xref><xref rid="ref135" ref-type="bibr">135</xref>] Although the research on the transmission of cariogenic and periopathogenic microorganisms is scarce and limited to a few agents, most experts agree that early transmission is a risk factor for disease.[<xref rid="ref136" ref-type="bibr">136</xref><xref rid="ref137" ref-type="bibr">137</xref>] Thus, the prevention of oral colonization by pathogenic microorganisms in children should start with the prevention / treatment of the caregiver's oral cavity.</p><p>However, it is known that the oral transmission of microorganisms can occur not only by vertical transmission, but also horizontally, between brothers and/or colleagues.[<xref rid="ref138" ref-type="bibr">138</xref><xref rid="ref139" ref-type="bibr">139</xref>] This is particularly important if we take into account the socioeconomic changes taking place in the last two to three decades in the Western culture. The children that are under the care of a nanny or in contact with other children in a day care center present additional vectors for oral microorganism acquisition. The genotyping of <italic>Streptococcus mutans</italic> in children aged between 12 to 30 months, attending a day care center, revealed that 29% of the children had two or more corresponding genotypes, strongly suggesting the occurrence of horizontal transmission within this population.[<xref rid="ref140" ref-type="bibr">140</xref>] It is interesting to note that those children attending day care centers present a lower level of their mothers’ <italic>S. mutans</italic> genotypes in comparison to children staying with their moms’.[<xref rid="ref141" ref-type="bibr">141</xref><xref rid="ref142" ref-type="bibr">142</xref>]</p><p>In addition to the microbial route of transmission, the host genetic factors may also influence the proportion of species in genetically related individuals. In twins, it was demonstrated that the oral microbiota is more alike than in non-related persons.[<xref rid="ref143" ref-type="bibr">143</xref>] Despite these intrafamilial similarities, the oral microbiota of children is unique and differs significantly from their parents and siblings, from an early age.[<xref rid="ref21" ref-type="bibr">21</xref>] These findings support the possibility of using the oral microbiota as a fingerprint.</p></sec></sec><sec sec-type="conclusion" id="sec1-2"><title>CONCLUSION</title><p>Throughout childhood the oral microbiome changes, maturates, and evolves. Along with the growth of the child, the oral microbial load increases, but the microbial diversity decreases. The type of first colonizers is related to different factors, such as, type of delivery, personal relationships, living environment, and so on. However, the set of initial oral colonizers seems to condition the subsequent colonization, which leads to more complex and stable ecosystems in adulthood. Therefore, these early microbial communities play a major role in the development of the microbiota in the adult oral cavity and may represent a source of both pathogenic and protective microorganisms at a very early stage of human life. Thus, the paediatric oral health care and prevention should start as early as its conception. The discovery that other oral habitats rather than teeth have relevant microbial colonization emphasizes the fact that when the dentist designs a preventive approach, he should take into account the oral cavity as a whole. Given that the child's family members, caregivers, and colleagues may represent an important source of oral microorganisms, the prevention of oral colonization by pathogenic microorganisms in children should start with the prevention/treatment of the life-sharing individuals’ oral cavity.</p></sec></body><back><fn-group><fn fn-type="supported-by"><p><bold>Source of Support:</bold> Nil</p></fn><fn fn-type="conflict"><p><bold>Conflict of Interest:</bold> None declared</p></fn></fn-group><ref-list><title>REFERENCES</title><ref id="ref1"><label>1</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Keijser</surname><given-names>BJ</given-names></name><name><surname>Zaura</surname><given-names>E</given-names></name><name><surname>Huse</surname><given-names>SM</given-names></name><name><surname>van der Vossen</surname><given-names>JM</given-names></name><name><surname>Schuren</surname><given-names>FH</given-names></name><name><surname>Montijn</surname><given-names>RC</given-names></name><etal></etal></person-group><article-title>Pyrosequencing analysis of the oral microflora of healthy adults</article-title><source>J Dent Res</source><year>2008</year><volume>87</volume><fpage>1016</fpage><lpage>20</lpage><pub-id pub-id-type="pmid">18946007</pub-id></element-citation></ref><ref id="ref2"><label>2</label><element-citation publication-type="journal"><article-title>Human Microbiome Project Consortium. 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