06/12/2025
Alzheimer’s may be linked to gum bacteria, new research shows.
Yes, the disease might not come from your brain at all — but a oral infection.
Emerging research suggests a surprising connection between gum disease and Alzheimer’s disease, offering a potential breakthrough in understanding—and possibly preventing—one of the most devastating brain disorders.
Scientists have found Porphyromonas gingivalis, the bacteria responsible for chronic gum disease, in the brains of deceased Alzheimer’s patients.
In lab experiments, mice infected with the bacteria developed hallmark Alzheimer’s features, including amyloid beta, a protein long associated with the disease. Even more striking, toxic bacterial enzymes were found in people with early brain changes linked to Alzheimer’s—well before any symptoms appeared—hinting that the infection may trigger damage years in advance.
This discovery is fueling hope for new treatments. One experimental drug, COR388 (developed by Cortexyme), has already shown promise in reducing both the bacteria and amyloid beta buildup in animal models. While more studies and human trials are needed, the findings support the idea that Alzheimer’s could have an infectious component, not just a degenerative one. For now, researchers are cautiously optimistic—but the implications are big: maintaining good oral hygiene could do more than preserve your smile; it might also help protect your brain.
Source: Dominy, S. S., et al. (2019). Porphyromonas gingivalis in Alzheimer’s disease brains: Evidence for disease causation and treatment with small-molecule inhibitors. Science Advances, 5(1), eaau3333.
