Silent tooth infection could be hurting your whole body

Scientists are uncovering a surprising link between hidden tooth infections and blood sugar problems. Recent research has found that people who had root canal treatment for long-lasting infections at the root tip experienced lower blood sugar and reduced inflammation over the following two years. The same pattern was seen in a longitudinal metabolomic analysis. Simply removing the infected tissue inside the tooth seemed to benefit the body far from the site of the infection.

One reason is that these infections do not always stay local. When bacteria reach the tissues around the tooth root, the immune system responds. If the infection persists, the body produces low-grade inflammation: a constant, simmering immune response that never fully switches off. This type of background inflammation can spread through the bloodstream and make it harder for the body to regulate sugar effectively because chronic inflammation interferes with how insulin works, reducing the body’s ability to move sugar out of the blood and into cells.

None of this means that root canals are a treatment for diabetes. Researchers are clear that causality is not yet established, so more controlled trials are needed. But the research strongly suggests that oral health has a wider role in metabolic health than most people realise. For people with diabetes or at risk of it, this connection matters. A painful tooth, or even one that simply feels different, could be more than a local problem. A properly treated tooth can save more than a smile; it may contribute to better overall health.

Originally published in The Conversation.

From: https://www.sciencedaily.com/releases/2026/05/260515002146.htm.