As early as 2017, Japanese researchers from Kyushu University in Fukuoka discovered in a study a connection between bad teeth and Alzheimer’s. They collected data from around 1,600 volunteers aged 60 and over and found that oral hygiene had a direct influence on mental health: the fewer of their own teeth older people still had, along with how poorer the condition that their teeth were in, the higher their risk of dementia or Alzheimer’s disease became.
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