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The much-dreaded dental surgery can also improve levels of blood sugar and cholesterol, say scientists.

In the first of its kind clinical study, researchers tracked changes in blood chemistry following root canal treatment for a common dental infection, called apical periodontitis.

The infection can cause bacteria to enter the bloodstream and increase inflammation, associated with risks to cardiac health and reduced ability to control blood sugar levels.

Despite the link between the infection and wider health impacts, the association between successful root canal treatment and the benefits to heart and metabolic health had not been investigated until now.

The findings, published in the , showed that successful root canal treatment was associated with improved glucose metabolism.

Blood sugar levels dropped "significantly" over two years after treatment, a key factor in preventing diabetes.

The treatment also resulted in better lipid profiles - short-term improvements in blood cholesterol and fatty acid levels - which are closely linked to heart health.

The findings also saw key markers of inflammation, often linked to cardiovascular risk and other chronic conditions, decreased over time.

Bacteria from infected teeth were associated with changes in the body’s overall metabolism, according to the findings.

The research team explained that root canal infections can cause bacteria to enter the blood, leading to inflammation, heart disease and diabetes risk.

But successful treatment reduced those risks.

The study followed the health of 65 patients from over two years after root canal treatment.

Scientists analysed molecules in the blood of patients to reveal how the body processes sugar, fat, other key substances, and responds to disease and treatment.

They used a technique known as nuclear magnetic resonance (NMR) spectroscopy, used to analyse proteins in the body.

The findings suggest that monitoring blood metabolic markers - such as glucose, fats known as triglycerides, and the protein tryptophan - could help assess recovery and risk after dental treatment.

Lead Author Dr. Sadia Niazi said: “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."

While more research is needed to confirm the effects in larger populations, she says the study opens "exciting new doors" for understanding how oral care can support general health and well-being.

Dr. Niazi, senior clinical lecturer in endodontology at , added: "It is vital that dental professionals recognise the wider impact of these root canal infections and advocate for early diagnosis and treatment.

“We also need to move towards integrated care, where dentists and general practitioners work together to monitor the risks through these blood markers and protect overall health.

"It’s time to move beyond the tooth and embrace a truly holistic approach to dental care.�