Pathogenic oral bacteria and biofilm

Pathogenic oral bacteria and their biofilms are complex, structured microbial communities that adhere to oral surfaces, primarily teeth and gingival tissues, encased in a self-produced matrix of extracellular polymeric substances (EPS) (Source: NIH, StatPearls). These biofilms, commonly referred to as dental plaque, provide a protective environment that shields constituent pathogens like Streptococcus mutans and Porphyromonas gingivalis from host immune responses and systemic antibiotics (Source: PubMed). The transition from a healthy, symbiotic oral microbiome to a dysbiotic, pathogenic biofilm state is the fundamental cause of dental caries and periodontal diseases. Drugs targeting these biofilms work by disrupting the bacterial cell envelope, inhibiting metabolic pathways, or interfering with the structural integrity of the EPS matrix. Because biofilms exhibit significantly higher resistance to antimicrobial agents compared to planktonic bacteria, effective treatment often requires a combination of chemical therapy and mechanical debridement. Furthermore, chronic oral biofilm infections are increasingly recognized as risk factors for systemic conditions, including cardiovascular disease and poorly controlled diabetes (Source: Mayo Clinic, NIH).

Other names

Dental plaqueOral biofilmOdontopathogenic bacteriaSubgingival biofilmSupragingival biofilmDysbiotic oral microbiome

Therapeutic agents target oral biofilms through several mechanisms: antiseptic agents like chlorhexidine disrupt bacterial cell membranes and inhibit enzyme activity; antibiotics such as amoxicillin or metronidazole inhibit cell wall synthesis or DNA replication in susceptible species; and various agents aim to chemically destabilize the extracellular polymeric substance (EPS) matrix to facilitate mechanical removal (Source: StatPearls, PubMed).