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Smile for dementia

Poor oral health is a risk factor for Alzheimer’s disease. What’s not clear is whether gum disease causes the disorder or is merely a result—many patients with dementia can’t take care of their teeth, for example. Now, a privately sponsored study has confirmed that the bacteria that cause gum disease are present in the brains of people with Alzheimer’s, not just in their mouths. The study also finds that in mice, the bacteria trigger brain changes typical of the disease.

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The new study, published today in Science Advances, was sponsored by the biotech startup Cortexyme Inc. of South San Francisco, California. Co-founder Stephen Dominy is a psychiatrist who in the 1990s became intrigued by the idea that Alzheimer’s could have an infectious cause.

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