Periodontitis, Porphyromonas gingivalis, and the inflammatory pathways linking gum disease to neurodegeneration.

The article focuses on the emerging evidence linking chronic periodontitis, a common inflammatory gum disease, to Alzheimer's disease (AD) through oral microbial dysbiosis and systemic inflammation. Porphyromonas gingivalis, a key periodontal pathogen, is implicated in promoting amyloid beta aggregation, tau pathology, and neuroinflammation associated with AD. Alzheimer's-related oral dysbiosis involves both an increase in pathogenic bacteria and a decrease in protective commensal species, highlighting ecological imbalance rather than isolated infection. The article emphasizes the importance of early periodontal diagnosis, comprehensive treatment, and maintenance to potentially reduce systemic inflammatory burden in patients at risk for neurodegeneration, while noting that causality remains to be definitively established.