How that root canal you’ve been dreading could actually be good for you

New research suggests that the routine root canal you’ve been putting off might offer more health benefits than anyone expected. Scientists say that treating an infected tooth doesn’t just protect your smile, it could also help improve overall body health and cut risks linked to diabetes and heart disease.

Wider health effects highlighted in new study

A two-year study at Guy’s and St Thomas’ NHS Foundation Trust in London followed 65 patients after successful root canal therapy. Researchers saw improvements across several key blood markers. Participants showed healthier cholesterol and fatty acid profiles, better fat metabolism, lower inflammation and even improved long-term blood sugar levels.

For the researchers, the results strengthen the connection between oral infections and the body’s overall health. High blood sugar and chronic inflammation are well-known contributors to type 2 diabetes and cardiovascular disease. Dr Sadia Niazi of King’s College London, who led the study, said the findings highlight the need to view dental and general health as one connected system rather than two separate worlds.

How dental infections affect the body

The team explained that untreated tooth infections allow harmful bacteria to enter the bloodstream, triggering inflammation throughout the body and disrupting normal blood sugar regulation. Over time, this can contribute to metabolic disorders, such as type 2 diabetes, and put extra strain on the heart and circulatory system.

These findings match earlier research showing that untreated dental infections can raise the risk of heart disease, due to ongoing inflammation, not the dental treatment.

Clearing up confusion around root canal treatment

Root canal therapy has long been the subject of myths and misinformation. Some claims suggest the procedure itself causes serious illness, including heart problems. Independent fact-checkers have repeatedly shown these claims to be false.

What the research actually shows is that leaving a dental infection untreated, or not treating it properly, can keep inflammation simmering in the body and worsen existing health risks. A successful root canal removes the infection at its source and gives the body a chance to recover.

A case for including dental care in wider health policy

The authors of the study say the findings support a stronger push to bring dental care into mainstream health planning. Millions across Europe and beyond live with untreated oral disease, often because of cost or limited access to dentists. If future research backs up these long-term benefits, routine dental treatment could become an essential part of preventing chronic illness.

And who knows, that root canal you’ve been avoiding might just end up doing you a world of good.