In 2010, researchers from New York University (NYU) concluded that there is a link between gum inflammation and Alzheimer’s disease, after reviewing 20 years of data on the association.

In 2013, UK-based researchers from the University of Central Lancashire (UCLan) built on the findings of this study, by comparing brain samples from 10 living patients with Alzheimer’s with 10 brain samples from people who did not have the disease.

Analysis showed that a bacterium – Porphyromonas gingivalis – was present in the Alzheimer’s brain samples but not in the samples from the brains of people who did not have Alzheimer’s. What was interesting was that P. gingivalis is usually associated with chronic gum disease.