The research, published in Alzheimer’s Research & Therapy, looked at more than 25,000 people to examine whether patients age 50 or older with severe gum disease – also called ‘chronic periodontitis’ – had an increased risk of developing Alzheimer’s disease.

https://www.dentalhealth.org/news/gum-disease-raises-risk-of-developing-alzheimers-disease-by-70-study-finds

Chang-Kai Chen (2017) ‘Association between chronic periodontitis and the risk of Alzheimer’s disease: a retrospective, population-based, matched-cohort study’, Alzheimer’s Research & Therapy, 9:56 https://doi.org/10.1186/s13195-017-0282-6