Study links periodontal disease to autoimmune disease

Dental Tribune International

Thu. 21. May 2026

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LONDON, England: Periodontal disease may be associated with wider systemic inflammatory and immune-related health risks, according to a new population-based study by researchers at King’s College London. The study examined the relationship between periodontal disease and autoimmune disease, as well as the combined association of both conditions with all-cause mortality during follow-up. The findings add to existing evidence linking periodontal health with systemic disease and suggest that periodontal disease may serve as a clinically relevant indicator of broader health vulnerability, particularly when it occurs alongside autoimmune disease.

For Dr Ke Zhou, the findings reinforce the importance of viewing oral health as part of general health. (Image: Dr Ke Zhou)

The study included 11,739 participants from the 2009–2014 National Health and Nutrition Examination Surveys in the US and 433,023 participants from the UK Biobank. The researchers found that autoimmune diseases were more common among individuals with periodontal disease, particularly among edentulous people. Autoimmune disease was associated with higher all-cause mortality, and this risk was further increased when periodontal disease was also present.

“This does not mean that periodontal disease directly causes autoimmune disease or death, but it does suggest that oral health may provide useful insight into a person’s general health status,” lead author Dr Ke Zhou, a PhD student at the Faculty of Dentistry, Oral and Craniofacial Sciences at King’s, told Dental Tribune International.

Dr Zhou said that the findings should be viewed in the context of established research on periodontal inflammation and systemic health and noted that periodontal disease may be connected to broader patterns of immune imbalance. “Many of us view dental problems as issues limited to the mouth. However, as a clinician, I am keen to put the mouth back into the whole body,” he said.

For dentistry, the findings reinforce the value of periodontal assessment as part of a broader understanding of patient health. “In everyday practice, dentists often see signs of disease, such as bleeding gingivae and loss of supporting tissue. Traditionally, these signs are understood primarily as oral health problems. Our study suggests that they may also indicate other conditions that have not yet been detected,” Dr Zhou said.

The findings may be particularly relevant for patients with autoimmune disease, who may already have a higher inflammatory burden. Dr Zhou suggested that regular periodontal assessment and early management of periodontal disease could be especially important in this group, although further research is needed to determine whether periodontal treatment, lifestyle interventions or improved access to care can reduce autoimmune disease burden or all-cause mortality.

The study, titled “Periodontal disease and systemic autoimmune disease burden: Population-based study on co-occurrence and mortality risk in the United States and the United Kingdom”, was published online on 25 March 2026 in the Periodontology Journal, ahead of inclusion in an issue.