Pooled research suggests that people with periodontitis are more likely to have rheumatoid arthritis than people with healthy gums. A 2020 meta-analysis of 13 studies (Qiao and colleagues, Joint Bone Spine) put the odds at about 1.7 times higher. Yet a very large Danish study published in 2024 found the link almost disappeared once possible confounding by smoking was allowed for. Both findings matter, and together they give a more accurate picture than either one alone.
The association shows up in both directions
Researchers have looked at this question from each side. Starting with rheumatoid arthritis, a 2016 meta-analysis (Fuggle and colleagues, Frontiers in Immunology) pooled 17 studies and found people with rheumatoid arthritis had a modestly higher risk of periodontitis than healthy controls, about 13 per cent higher. They also had deeper gum pockets, more bleeding and more attachment loss on average. Interestingly, when people with rheumatoid arthritis were compared with people with osteoarthritis rather than healthy controls, the difference in periodontitis disappeared.
Starting with gum disease, the Qiao meta-analysis mentioned above found the higher odds of rheumatoid arthritis. So the two conditions do tend to appear in the same people more often than chance would predict.
Shared risk factors may explain much of the overlap
An association is not proof that one disease causes the other. The 2024 Danish cohort (Raittio and colleagues, ACR Open Rheumatology) followed more than three million adults using national health records. After careful modelling, periodontitis did not meaningfully raise the chance of later developing rheumatoid arthritis, and the cross-sectional link was close to zero once the possible effect of smoking was simulated. The authors suggested that confounding, meaning factors the two conditions have in common, may be an important part of the story.
Smoking is the clearest of those shared factors. It is a recognised risk factor for both conditions, and it is also one of the few that a person can change.
There are plausible biological links too
Both rheumatoid arthritis and periodontitis are long-running inflammatory diseases. In one the immune response targets the lining of the joints; in the other it breaks down the tissue and bone supporting the teeth in response to plaque bacteria. Some of the same inflammatory messengers are involved in both.
One gum bacterium, Porphyromonas gingivalis, has attracted particular attention. It carries an enzyme that can citrullinate proteins, changing them in a way the immune system may recognise as foreign. Reviews (for example Chow and colleagues, Frontiers in Cellular and Infection Microbiology, 2022) describe this as a possible route linking gum infection to autoimmune changes in rheumatoid arthritis. It remains an area of active research rather than a settled explanation.
What treating gum disease can and cannot do
A 2021 meta-analysis of nine studies (Sun and colleagues, Clinical Oral Investigations) found that non-surgical gum treatment, such as a thorough deep clean below the gum line, was followed by modest reductions in rheumatoid arthritis activity scores, swollen and tender joint counts and a blood marker of inflammation in people who had both conditions. The evidence is still limited, and gum treatment is not a treatment for arthritis. Any decisions about arthritis medicines belong with your GP or rheumatologist.
What gum treatment can reliably do is reduce inflammation and infection in the mouth and help keep teeth for longer. That is reason enough to look after your gums, whatever the final verdict on the joint connection.
Rheumatoid arthritis can make gum care harder
Stiff, painful hands make brushing and cleaning between the teeth harder, and some people with rheumatoid arthritis also have a dry mouth. Less saliva means less natural protection against decay and gum inflammation. A few practical changes can help:
- An electric toothbrush has a thicker handle and does more of the work.
- Interdental brushes with a grip, or a water flosser, can be easier than string floss. Our guide to using a water flosser explains how.
- Sips of water and sugar-free gum can ease a dry mouth; tell your dentist if it is ongoing.
- Let the dentist or OHT know about your arthritis and medicines, so appointments can be planned around flares.
Gums that bleed when you brush are often the first sign of gum inflammation. If they still bleed after three or four days of careful brushing and flossing, it is worth booking a check. Our article on bleeding gums when brushing has more detail. Gum health has also been studied alongside diabetes, heart disease and stroke.
Common questions
If I have gum disease, will I get rheumatoid arthritis?
No. Most people with gum disease never develop rheumatoid arthritis. The research shows the two occur together more often than expected, and the largest recent study suggests shared factors such as smoking may explain much of that.
Should I tell my dentist I have rheumatoid arthritis?
Yes. It helps the dentist or OHT suggest cleaning aids that suit your hands, watch for dry mouth and plan visits around how you are feeling.
Can my arthritis medicines affect my mouth?
Some medicines can contribute to a dry mouth or other changes. Bring an up-to-date list to your appointment so the dentist can take it into account.
If you live with rheumatoid arthritis and would like a gum check and cleaning routine that suits your hands, the team at Lumi Dental can help. See our current options or get in touch to book.
This article is general information and not a substitute for personal dental or medical advice. Discuss your arthritis with your doctor or rheumatologist.
