Key points from article :
Scientists suspect that bacteria causing gum disease can trigger Alzheimer's disease.
Gum disease is more common in Alzheimer's patients.
Proteins produced by P. gingivalis are present in higher concentrations in their brains.
Mice infected by mouth with P. gingivalis later showed signs of brain infection and deterioration.
Cell cultures infected with P. gingivalis showed signs of fractured or broken-up tau protein.
Post-mortem brain tissue samples from around 100 people with and without Alzheimer's disease were examined.
Collaborative research published in the journal Science Advances.
