A study discovered the presence of Porphyromonas gingivalis, a bacterium responsible for chronic periodontitis, in the brains of deceased Alzheimer’s patients.

Researchers found that when mice were infected with the bacteria, it colonised their brains and triggered the production of amyloid beta, a protein commonly associated with Alzheimer’s.

The evidence strengthens the hypothesis that the disease could have infectious origins rather than being solely a neurodegenerative disorder.

The study also revealed that toxic enzymes from the bacteria were present in individuals who had Alzheimer’s-related brain changes but had not yet been diagnosed with dementia, suggesting the infection may begin years before symptoms appear.

This discovery opens the door to new potential treatments. A pharmaceutical company, Cortexyme, developed a compound called COR388, which showed promise in reducing both bacterial infection and amyloid beta accumulation in animal trials.

While human trials are needed to confirm its effectiveness, the study underscores the importance of oral hygiene in brain health.

Scientists remain cautiously optimistic, emphasising that with no new dementia treatments in over 15 years, investigating all possible causes is crucial.

While more research is needed, the link between gum disease and Alzheimer’s highlights a simple yet vital message: taking care of your teeth might help protect your brain in the long run.