09/08/2026
Scientists have discovered another reason to floss.
A large study following more than 6,000 U.S. adults for 25 years found that people who flossed regularly had a lower risk of ischemic stroke, stroke caused by blood clots from the heart, and atrial fibrillation (irregular heartbeat).
Researchers with the ARIC (Atherosclerosis Risk in Communities) study reported flossing was associated with a 22% lower risk of ischemic stroke, a 44% lower risk of cardioembolic stroke, and a 12% lower risk of atrial fibrillation — even after accounting for brushing and dental visits.
The likely explanation is inflammation: gum disease and untreated plaque are linked to systemic inflammation that can affect blood vessels and heart rhythm. Reducing that inflammation through flossing may partly explain the lower risk.
The study does not prove that flossing directly prevents stroke, but it adds to growing evidence that what happens in the mouth can influence the rest of the body.
A few minutes with dental floss each day could benefit far more than your smile.
Source: Sen S, et al. "Dental Flossing May Lower the Risk for Incident Ischemic Stroke, Cardioembolic Stroke Subtype, and Atrial Fibrillation." Stroke. 2026;57(5):1273–1282. doi:10.1161/STROKEAHA.125.054440
