A clinical study from King's College London found that successful root canal treatment may improve blood sugar control, cholesterol levels, and systemic inflammation over a two-year period. The research, published in the Journal of Translational Medicine, tracked 65 patients treated at Guy's and St Thomas' NHS Foundation Trust following root canal procedures for apical periodontitis.

Apical periodontitis allows bacteria from the tooth to enter the bloodstream, where they can trigger inflammation associated with cardiovascular disease and impaired glucose metabolism. Researchers used nuclear magnetic resonance spectroscopy to analyse blood metabolites before and after treatment, identifying changes in glucose, triglycerides, and tryptophan levels.

Blood sugar dropped over the two years following treatment, and patients showed short-term improvements in lipid profiles. The findings suggest that metabolic blood markers could help clinicians monitor recovery and systemic health risks after dental treatment. The authors call for closer collaboration between dentists and general practitioners to track these markers and identify patients at elevated risk of diabetes or heart disease. Larger studies are needed to confirm the results, but the data point to a measurable systemic benefit from treating chronic dental infections promptly.