People with severe gum inflammation (periodontitis) have a considerably higher risk of cardiovascular disease, presumably through bacteria and body-wide inflammation. A direct causal relationship has not yet been conclusively proven, and shared genetic predisposition also plays a role.
People with severe gum inflammation, also known as periodontitis, have a clearly higher risk of cardiovascular disease. An umbrella review of 41 systematic studies found that the risk of heart disease was 1.2 to 4.4 times higher in people with periodontitis compared with people without it. In a large American population study (NHANES), people with severe gum disease had nearly 3.6 times the rate of cardiovascular disease compared with people with mild complaints. The association has therefore been found clearly and consistently.
One possible explanation for this association is that bacteria from inflamed gum pockets enter the bloodstream. This triggers a body-wide inflammatory response and promotes the formation of atherosclerosis (the build-up of fat and calcium in the arterial wall) and increased blood clotting. Both processes are well-known risk factors for heart attacks and strokes.
The association is not limited to heart attacks or strokes. Multiple systematic reviews also describe links with cardiac arrhythmias (atrial fibrillation), narrowed coronary arteries, heart failure, and peripheral artery disease in the legs. Causality has not been proven separately for each condition, but the breadth of the association makes the relationship remarkably consistent.
There is an important caveat: part of the association may be explained by shared genetic predisposition. Researchers have identified at least 4 locations in the DNA that raise the risk of both gum disease and atherosclerosis. This means that some people are simply genetically more susceptible to both conditions simultaneously, which may partly explain the relationship without one disease causing the other.
There are indications that treating gum disease (periodontal therapy) may contribute to better management of cardiovascular risk factors such as high blood pressure and diabetes. The evidence for this is, however, still too limited for firm conclusions. Well-designed randomised trials are needed to confirm whether treating gum disease actually reduces heart risk.
Finally, it is important to distinguish between gingivitis (mild, superficial gum inflammation) and periodontitis (the more severe form in which bone and supporting tissue are damaged). Gingivitis is fully reversible, and the cardiac risks have been described primarily in connection with periodontitis. Mild, well-treated gum problems therefore appear to carry little to no independent risk.
Based on an umbrella review of 41 systematic studies, multiple separate meta-analyses, and a large population study (NHANES). The evidence is consistently associative but no proven causal relationship has been established. PMIDs: 39468505, 35773046, 38141902, 30897827, 29903685, 39494478, 32385877, 16298220.