Microbiota and Dental Health in Primary Dentition

The primary dentition constitutes a dynamic ecosystem in which microbial communities colonise the oral cavity shortly after tooth eruption. These microbiota encompass a diverse range of bacteria, fungi and archaea that inhabit saliva, supragingival plaque and mucosal surfaces. Their composition and functional activities influence the emergence of common paediatric conditions such as early childhood caries and extrinsic black stain. In health, a balanced microbial consortium contributes to enamel remineralisation, maintenance of pH homeostasis and competition against opportunistic pathogens. Perturbations in community structure—often termed dysbiosis—can lead to acidogenic and proteolytic processes that erode enamel or precipitate pigmented deposits. Recent advances in high-throughput sequencing, metagenomics and machine-learning classifiers have illuminated the temporal succession of key taxa during the first years of life, revealing potential biomarkers for risk assessment and new targets for preventive interventions. Understanding the interplay between diet, salivary biochemistry and oral microbiota is essential for devising minimally invasive strategies that promote lifelong dental resilience.

Research from Nature Portfolio

A metagenomic comparison of extrinsic black stain and white plaque analysed taxonomic and functional pathways, uncovering a marked reduction in species diversity within black stain and enrichment of heme biosynthesis routes. The findings suggest that iron–heme interactions foster a community phenotype that is less cariogenic yet predisposed to pigment formation.
A multicentre study of risk factors for black dental plaque in healthy volunteers established that high iron content and elevated pH in drinking water, together with raised salivary pH, significantly increase stain prevalence. The work emphasises modifiable environmental variables and supports water treatment and pH-modulation as preventive measures.

Microbiota and Dental Health in Primary Dentition publication trend

The graph below shows the total number of articles in microbiota and dental health in primary dentition across all publications each year (not limited to Nature Index journals).

Technical terms

Microbiota: The collective microorganisms inhabiting a defined environment, such as the oral cavity.

Early childhood caries (ECC): Rapid decay of primary teeth in young children, influenced by microbial acid production.

Extrinsic black stain (EBS): Dark pigmented deposits on tooth surfaces, typically of microbial and mineral origin.

Supragingival plaque: Microbial biofilm forming on the tooth surface above the gum line.

Dysbiosis: Disruption of a healthy microbial community leading to disease-promoting processes.

References

1. Dental black plaque: metagenomic characterization and comparative analysis with white-plaque. Scientific Reports (2020).
2. Risk factors for the presence of dental black plaque. Scientific Reports (2018).
3. Characterization of the oral microbiome and gut microbiome of dental caries and extrinsic black stain in preschool children. Frontiers in Microbiology (2023).
4. Oral microbial community typing of caries and pigment in primary dentition. BMC Genomics (2016).
5. Salivary Microbiome Variation in Early Childhood Caries of Children 3–6 Years of Age and Its Association With Iron Deficiency Anemia and Extrinsic Black Stain. Frontiers in Cellular and Infection Microbiology (2021).