Root canal treatment can reduce heart disease and diabetes risk, find researchers

A tooth infection might be doing more than you think, new study suggests. Most people think of a root canal as something you get to fix a painful tooth and move on. It’s dental, local, contained. You deal with it, and that’s that. But new research is now pushing that idea a bit further. It suggests that treating a tooth infection may actually have effects well beyond your mouth—touching things like blood sugar, inflammation, and even heart health.However, a recent clinical study from researchers at King’s College London looked at patients with a common dental infection known as apical periodontitis. It’s the kind of infection that sits deep in the tooth, often unnoticed until it becomes painful. But what the researchers found is that this infection doesn’t always stay in one place. Bacteria from infected teeth can enter the bloodstream, setting off low-grade inflammation across the body.In the study, 65 patients who underwent root canal treatment were followed over a period of two years. And the changes weren’t just dental. Researchers tracked what was happening in their blood, like glucose levels, fats, and markers of inflammation.The results showed a pattern. After the infection was treated, blood sugar levels dropped over time. Cholesterol and fatty acid levels improved, at least in the short term. Inflammation, which is often linked to heart disease and metabolic issues, also reduced gradually.It suggests that an infection in your mouth could quietly be affecting how your body handles sugar and fats. Not in a dramatic, overnight way. But slowly, in the background.So treating the infection isn’t just about saving the tooth. It’s about removing a source of stress on the body.“Our findings show that root canal treatment doesn’t just improve oral health – it may also help reduce the risk of serious health conditions like diabetes and heart disease. It’s a powerful reminder that oral health is deeply connected to overall health. Long-standing root canal infections can allow bacteria to enter the bloodstream, trigger inflammation, and increase blood glucose and fats levels – raising the risk of serious health issues like heart disease and diabetes. It is vital that dental professionals recognise the wider impact of these root canal infections and advocate for early diagnosis and treatment," Lead Author Dr Sadia Niazi, Senior Clinical Lecturer in Endodontology, King’s College London has said.At the same time, researchers are clear that this isn’t a magic fix. But it does add to a growing understanding. That the body doesn’t work in isolated parts.And something as routine as a tooth infection might be playing a bigger role than we’ve given it credit for. So the next time a dentist says “this needs treatment,” it might not just be about your tooth. It could be about your overall health, too.