A successful root canal does more than save a tooth. Recent studies suggest that clearing a dental infection can also calm inflammation and help the heart, blood sugar, and cholesterol.
Scientists at King's College London studied people who had a root canal for a common tooth infection called apical periodontitis. This infection can let bacteria slip into the bloodstream, sparking inflammation that is linked to heart disease and poor blood‑sugar control.
While doctors have long suspected that mouth infections affect the whole body, this is one of the first studies to look closely at the health changes after the infection is treated.
Positive Changes After Treatment
- Lower blood sugar: Participants saw a steady drop in glucose levels over the two years after their root canal.
- Better cholesterol: Short‑term improvements were recorded in total cholesterol and fatty acids, both important for heart health.
- Less inflammation: Markers that usually rise with heart disease gradually fell.
- Oral bacteria impact: Bacteria from the infected tooth appeared to affect the body's overall metabolism.
When bacteria from a tooth reach the blood, they can raise inflammation, which in turn can increase the risk of heart problems and diabetes. Removing the infection seems to reverse some of these risks.
How the Study Was Done
The researchers followed 65 patients treated at Guy's and St Thomas' NHS Foundation Trust. They checked blood samples for two years after each root canal.
Using a method called nuclear magnetic resonance (NMR) spectroscopy, they measured proteins, sugars, fats, and other molecules. This gave a clear picture of how the body handled sugar and fat after the dental procedure.
Blood Markers as Recovery Signals
Some blood chemicals—like glucose, triglycerides, and the protein tryptophan—could serve as clues for doctors to see how well a patient is recovering and whether any hidden health risks remain.
"Long‑standing tooth infections can let bacteria travel in the blood, trigger inflammation, and raise sugar and fat levels. Dentists need to understand this broader impact and treat infections early," one researcher said.
Another expert added, "We should work together with doctors to monitor these blood markers. Dental care is part of overall health, not just a single tooth."
What Comes Next
More large‑scale studies are needed to confirm these findings. Still, the research opens a new view of how keeping teeth healthy may protect the heart and help control diabetes.
The study was published in the Journal of Translational Medicine and funded by the Royal College of Surgeons (RCS) England.