How mouth bacteria may contribute to Alzheimer’s

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A new study published in Science Advances, has found that bacteria normally present in the mouth can release toxins that make their way into the brain. Once there they may contribute to neurological conditions like Alzheimer’s disease. The research highlights the risks of harmful bacteria migrating from the mouth to the brain and emphasizes the importance of good oral hygiene in preventing this. Regular brushing, flossing, and professional dental care can help reduce the likelihood of bacterial migration, supporting both oral and brain health.

Source

Adnan, D., Engen, P.A., Villanueva, M. et al. Oral microbiome brain axis and cognitive performance in older adults. npj Dement. 1, 1 (2025). https://doi.org/10.1038/s44400-025-00004-4

Additional Reading

https://www.healthline.com/health-news/bacteria-in-your-mouth-can-find-its-way-to-your-brain

https://www.mdanderson.org/cancerwise/how-to-take-care-of-your-oral-microbiome.h00-159701490.html

https://www.kcl.ac.uk/news/mouth-and-gut-bacteria-linked-to-brain-changes-in-parkinsons-disease