Gum disease (periodontitis) appears to be associated with a six-fold increase in the rate of cognitive decline in persons with Alzheimer’s Disease already.
Howell, D. (2016). Gum disease link to Alzheimer’s, research suggests. London: BBC Health News, March 10th 2016.
Further details are provided in the following critical appraisal:
Gum disease linked to worsening dementia symptoms. London: NHS Choices Behind the Headlines, March 11th 2016.
This relates to:
Ide, M. Harris, M. [and] Stevens, A.[et al] (2016). Periodontitis and Cognitive Decline in Alzheimer’s Disease. PLoS One. March 10th 2016; 11(3): e0151081.
An earlier more general review, possibly also of interest:
Gaur, S. [and] Agnihotri, R. (2015). Alzheimer’s disease and chronic periodontitis: is there an association? Geriatrics and Gerontology International. April 2015; 15(4): 391-404.