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March 17, 2026
Marianne Waldenfels
A root canal can do more than save your tooth — it may improve blood sugar, cholesterol, and inflammation
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A root canal is generally considered the last resort for a severely inflamed tooth. However, new research from London suggests that the procedure could achieve much more – namely measurable improvements in key metabolic and cardiovascular markers throughout the body.
Researchers at King’s College London have investigated how the treatment of a so-called apical periodontitis – an inflammation at the root tip – affects the entire organism. The focus was on whether the successful elimination of the infection not only affects the affected tooth but also influences systemic inflammatory processes.
Background: Inflammation in the mouth is often not just a local problem. Bacteria and inflammatory mediators from the infected tissue can enter the bloodstream and influence processes in various organ systems. Chronic inflammation is considered an important risk factor for cardiovascular diseases and metabolic disorders like diabetes.
For the current study 65 patients with apical periodontitis were observed over a period of two years after their root canal treatment. Blood samples were taken at regular intervals and various laboratory values associated with cardiovascular health and metabolism were analyzed.
The researchers focused on, among other things:
The evaluations show: After successful treatment of the dental root inflammation, several of these laboratory values improved in many participants.
Observed were, among other things:
The results suggest that treating chronic dental root inflammation not only reduces pain and preserves the tooth but may also have systemic effects on inflammation, sugar, and fat metabolism.
The assumption that oral health and general health are closely linked is not new. Chronic inflammation in the oral cavity – for example, due to periodontitis – has long been associated with cardiovascular diseases, diabetes, and other systemic diseases.
The new study now provides more concrete indications of how strong this connection might be in root canal infections. The bacteria in the root canal and the inflammatory processes they trigger seem to:
If the infection is sustainably eliminated, the body can apparently recover not only locally in the tooth but also in the blood count.
In practice, certain blood markers could play a larger role in the future. Values such as glucose, triglycerides, or selected metabolic products (such as amino acids like tryptophan) could help assess how a root canal treatment affects general health.
The study authors emphasize that the results show above all one thing: Dentistry and general medicine should work more closely together. Dentists and general practitioners can jointly contribute to recognizing inflammatory risks early, treating them, and embedding them in a holistic treatment concept.
As promising as the data is, it should not be overinterpreted:
Nevertheless, the results highlight how important it is to take root canal inflammation seriously and not postpone treatment—both from a dental and general medical perspective.
An inflamed tooth is not an isolated problem in the mouth. If a root canal inflammation is consistently treated, not only the affected tooth benefits: Inflammatory markers, blood sugar, and blood lipid levels can also improve—and thus possibly the risk for cardiovascular and metabolic diseases.
In other words, the path to better health sometimes actually leads through the dentist's chair – albeit embedded in an overall healthy lifestyle and good medical care.
Yes. Bacteria from the infected tissue can enter the bloodstream and trigger systemic inflammatory processes that are associated with cardiovascular diseases. Consistent treatment can reduce this strain.
According to a study by King's College London, blood sugar parameters improved in many patients after successful treatment – a possible indication of relief in sugar metabolism due to the reduction of chronic inflammation.
Chronic inflammations in the oral cavity – for example, due to periodontitis or apical periodontitis – can increase inflammation markers in the blood and thus raise the risk for heart diseases, diabetes, and other systemic diseases.
Yes. Even a painless tooth root inflammation can maintain silent chronic inflammatory processes in the body. Dentists and general practitioners therefore recommend not postponing such findings.
