Answer is B. Cardiovascular disease

Until then considered harmless, oral bacteria could be much more toxic, causing inflammation of the arteries. Bacteria would be the enemy of our arteries. Indeed, our mouth contains many bacteria. However, if we do not brush our teeth well, these bacteria proliferate and cause gingivitis or periodontitis. The resulting bleeding puts bacteria in the bloodstream. Blood clots can stick to the walls of the arteries and block the blood supply to the heart and brain, creating the conditions for a stroke.

Similarly, even low intensity periodontitis should be taken very seriously, as it can hide a more serious problem with the blood vessels.