Dental Plaque: Formation, Consequences, and Prevention

Dental plaque is a structured biofilm adhering to tooth surfaces, composed of bacteria (primarily Streptococcus mutans, S. sanguinis), salivary glycoproteins, food debris, and extracellular polysaccharides.

Pathogenic Sequence

1. Acquired pellicle forms on enamel within minutes of cleaning.
2. Early colonizers (streptococci, actinomyces) adhere via adhesins.
3. Late colonizers (anaerobes: Porphyromonas gingivalis, Tannerella forsythia) coaggregate.
4. Matrix production (glucans, fructans) creates 3D architecture.
5. Maturation: acidogenic bacteria ferment sugars → lactic acid → pH <5.5 → enamel demineralization.
6. Mineralization → calculus (tartar) → requires professional scaling.

Consequences

• Dental caries (cavities).
• Gingivitis → periodontitis (bone loss, tooth mobility).
• Halitosis.
• Systemic links: cardiovascular disease, diabetes exacerbation, aspiration pneumonia.

Prevention

• Brush 2×/day with fluoride toothpaste (2 min, modified Bass technique).
• Clean interdentally daily (floss, interdental brushes, water flosser).
• Limit fermentable carbohydrate frequency.
• Fluoride varnish, sealants (professional).
• Regular prophylaxis (q6mo).
• Antimicrobial rinses (chlorhexidine 0.12%) adjunctive for high risk.

Plaque control is the foundation of oral and systemic health.