Oral plaque bacteria and tooth enamel

Oral plaque bacteria and tooth enamel constitute the primary site of dental caries pathogenesis, involving a dynamic interaction between a polymicrobial biofilm and mineralized host tissue (NIH). The oral biofilm, or dental plaque, contains acidogenic bacteria such as Streptococcus mutans and Lactobacillus species that ferment dietary sugars to produce lactic acid (PubMed). This acid production drops the local pH below the critical threshold of approximately 5.5, causing the dissolution of hydroxyapatite crystals within the tooth enamel (Wikipedia). Therapeutic interventions target this interface by utilizing antimicrobials like chlorhexidine to reduce bacterial colonization or fluoride to enhance enamel resistance by forming fluorapatite (StatPearls). Fluorapatite is significantly less soluble under acidic conditions than the original hydroxyapatite, providing a protective barrier against further decay. Managing this target system is essential for preventing tooth decay, gingivitis, and subsequent systemic inflammatory conditions linked to oral dysbiosis (NCBI).

Other names

Dental plaqueDental biofilmTooth enamelCariogenic biofilmOral microbiota

Drugs targeting this system work through multiple pathways: fluoride inhibits bacterial enolase and promotes the formation of acid-resistant fluorapatite in enamel (StatPearls); chlorhexidine and cetylpyridinium chloride disrupt microbial cell membranes (NCBI); and xylitol acts as a non-fermentable sugar alcohol that inhibits the growth and acid production of Streptococcus mutans (PubMed).