In the largest study of its kind, Wu studied the health data of 34,000 patients in the US to find that for every tooth someone loses, they have a 1.4% increase in risk of cognitive impairment and 1.1% heightened risk of dementia. Overall, those who had lost teeth had a 48% raised risk of cognitive impairment and a 28% raised risk of dementia, compared with similar individuals who had all their teeth.

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