Flossing once a week may lower stroke risk, study suggests
Flossing may be doing far more than protecting your smile. A large long-term study from the University of South Carolina School of Medicine suggests that flossing as little as once a week is linked to a significantly lower risk of stroke and certain heart rhythm disorders. The findings highlight how everyday oral hygiene habits may play a meaningful role in protecting brain and cardiovascular health.
Oral hygiene and stroke risk: what the study found
Researchers analyzed data from approximately 6,300 adults who were followed for more than 25 years. About 65 percent of participants reported flossing at least once a week. During the follow-up period, more than 400 participants experienced a stroke, and over 1,300 developed atrial fibrillation, a major risk factor for stroke.
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Compared with non-flossers, people who flossed at least weekly showed a 21 percent lower risk of ischemic stroke, a 44 percent lower risk of cardioembolic stroke, and a 12 percent lower risk of atrial fibrillation. More frequent flossing was associated with even greater reductions in risk.
Why flossing may protect the heart and brain
Scientists believe inflammation is the key link between oral health and stroke. Gum disease and oral infections trigger chronic inflammation, which can damage blood vessel linings, promote clot formation, and disrupt normal heart rhythm. By reducing plaque and gum inflammation, flossing may help lower this systemic inflammatory burden, reducing the chances of clots forming or abnormal heart rhythms developing.
Oral inflammation has also been linked to atherosclerosis, the hardening and narrowing of arteries that raises the risk of heart attacks and strokes. Regular flossing helps control the bacterial load that contributes to this process.
Not proof, but a powerful signal
The researchers caution that the study was observational, meaning it shows an association rather than direct cause and effect. Flossing may also be part of a broader healthy lifestyle that includes balanced diet, exercise, and routine medical care. Still, the strength and consistency of the findings reinforce the growing scientific consensus that oral health is closely tied to overall health.
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A global oral health challenge
Worldwide, more than 3.5 billion people suffer from oral diseases such as untreated cavities and gum disease. In the United States alone, about 40 percent of adults have some form of periodontal disease, rising to nearly 60 percent among those over 65. These figures underline the public health importance of simple, preventive habits such as brushing, flossing, and regular dental checkups.
What this means for patients and dentists
For patients, the message is clear: flossing is a low-cost, easy habit with potential benefits beyond the mouth. For dental professionals, the findings strengthen the case for emphasizing interdental cleaning as part of routine preventive care and patient education. Oral hygiene should be seen not only as a way to prevent cavities and gum disease, but also as part of a heart- and brain-healthy lifestyle.
Bottom line
Flossing once a week may be a small habit with big implications. While more research is needed to confirm a direct protective effect, this study adds to growing evidence that keeping gums healthy may help reduce the risk of stroke and heart rhythm disorders. Good oral hygiene is not just about teeth. It is an investment in overall health.
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