A new study finds evidence that a pathogen involved in gum disease can be found in the brain of Alzheimer's patients.

 

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.