People with gum disease have strokes more often than people with healthy gums. That pattern has now turned up in dozens of studies across many countries, but nobody has yet shown that inflamed gums directly cause a stroke. What the research does support is a modest, sensible step: keeping your gums healthy is cheap, safe and sits comfortably alongside the things your doctor already asks you to do for your blood vessels.
Two recent reviews put a number on the link
In 2025 two research groups pooled the published studies. Zhang and colleagues, writing in the Journal of Evidence-Based Dental Practice, combined 36 studies with more than 7.6 million participants and found that people with periodontal disease had about 1.7 times the odds of stroke compared with people without it. The link appeared stronger for ischaemic stroke (caused by a blocked artery) than for haemorrhagic stroke (caused by bleeding).
Meng and Chen, in Frontiers in Neurology, looked only at cohort and case-control studies. In the cohort studies, which follow people forward in time, periodontitis was linked with roughly a 50 per cent higher risk of a new stroke. The authors were careful to say that the studies varied a lot and that other factors may explain part of the result, so their findings point to an association rather than proof of cause.
That caution matters. Smoking, diabetes, high blood pressure, age and lower access to health care all raise stroke risk, and most of them also make gum disease more likely. Researchers try to adjust for these, but no observational study can untangle them completely.
Inflammation is the most likely connection
Periodontitis is a long-lasting infection and inflammation of the tissues that hold the teeth in place. Inflamed, ulcerated gum pockets give bacteria and inflammatory chemicals a route into the bloodstream. The leading theory is that this ongoing, low-level inflammation adds to the damage inside artery walls that leads to narrowing, plaque build-up and clots. The same idea underlies the links researchers have found between gum disease and heart disease and between gum disease and diabetes.
It is a plausible explanation, and laboratory work supports parts of it, but it has not been confirmed as the reason for the pattern seen in large populations.
Does treating your gums lower the risk?
Nobody has run a trial long enough to answer this directly, so the evidence comes from comparing groups of people. A 2026 review by Moldes and colleagues in the International Journal of Dental Hygiene pooled seven studies with almost 1.9 million participants. People who had periodontal care, scaling in particular, had a lower rate of ischaemic stroke, about 16 per cent lower overall. A long US study published in Stroke in 2026 (Sen and colleagues) found that adults who reported regular flossing had fewer ischaemic strokes over more than 20 years of follow-up, even after allowing for brushing, dental visits and gum disease.
Both findings are encouraging, yet people who look after their teeth often look after their health in other ways too. The fair reading is that gum care may help, and it is very unlikely to do harm.
Bleeding gums are not a warning sign of stroke
If your gums bleed when you brush, that usually means early gum inflammation (gingivitis), which is common and reversible with better cleaning and a professional clean. It is not a sign that a stroke is coming. The risk factors that matter most for stroke are still blood pressure, smoking, diabetes, cholesterol, atrial fibrillation and physical activity, and those are managed with your GP. Gum care adds to that work; it does not replace it.
Habits that protect your gums
- Brush twice a day with a fluoride toothpaste and clean between your teeth once a day. Our brushing guide covers technique.
- Book in with a dentist or OHT if your gums bleed, look red or swollen, or seem to be pulling back. Our article on bleeding gums explains what to look for.
- Keep up regular check-ups and professional cleans, which remove hardened deposits under the gumline that a toothbrush cannot reach.
- If you smoke, Quitline (13 7848) offers support to help you quit. Stopping helps both your gums and your arteries.
- Tell your dentist about diabetes, heart conditions or any blood-thinning medicine, and tell your doctor if you have been told you have gum disease.
Know the signs of a stroke
Stroke is a medical emergency. The Stroke Foundation's F.A.S.T. test asks: has the person's face drooped, can they lift both arms, is their speech slurred or confused, and remember that time is critical. If you see any of these signs, call 000 straight away.
Common questions
Does gum disease cause strokes?
The research shows that the two are linked, not that one causes the other. Shared risk factors such as smoking and diabetes explain part of the link, and inflammation may explain some of the rest.
I have had a stroke. Does my gum health still matter?
Yes. Keeping the mouth clean can be harder after a stroke if one hand is weak, and gum health is part of general health. A dentist or OHT can suggest easier cleaning aids and a check-up schedule that suits you.
Should my doctor and dentist talk to each other?
It helps when both know the full picture. Bring a list of your medicines to dental visits, and mention gum disease to your GP, especially if you have diabetes or heart disease.
Book a gum check
If your gums bleed, feel tender or have not been checked for a while, our dentists and oral health therapists can examine them, explain what they find and help you keep them healthy. You can book online or see our current offers. This article is general information and not a substitute for personal dental or medical advice. If you are worried about your stroke risk, speak with your doctor.
