American Stroke Association International Stroke Conference 2025 – Abstract 19
Regularly flossing, even just once a week, may significantly reduce the risk of stroke caused by blood clots and irregular heartbeats (atrial fibrillation or AFib), according to a preliminary study presented at the American Stroke Association’s International Stroke Conference 2025 in Los Angeles (Feb. 5-7, 2025).
“Oral diseases are highly prevalent, affecting billions,” said Dr. Souvik Sen, lead author and Chair of Neurology at Prisma Health Richland Hospital and the University of South Carolina School of Medicine. “We aimed to identify the impact of flossing, brushing, and dental visits on stroke prevention.”
The Atherosclerosis Risk in Communities (ARIC) study, involving over 6,000 participants, revealed that those who flossed had:
- A 22% lower risk of ischemic stroke (caused by blood clots).
- A 44% lower risk of cardioembolic stroke (clots from the heart).
- A 12% lower risk of AFib.
These benefits were independent of brushing frequency or dental visits. Notably, increased flossing frequency correlated with greater stroke risk reduction.
During the 25-year follow-up, 434 participants experienced strokes, and 1,291 developed AFib. The study considered factors like blood pressure, diabetes, and smoking.
“Flossing likely reduces stroke risk by lowering oral inflammation and promoting healthy habits,” Dr. Sen explained. “It’s an accessible and affordable health practice.”
Researchers were surprised by the link to reduced AFib, a major stroke risk factor affecting millions.
Study limitations include reliance on self-reported flossing habits and a focus on stroke and heart outcomes.
“This study provides valuable insights into dental health and stroke risk,” said Dr. Daniel T. Lackland, an American Heart Association expert. “Further research could lead to incorporating dental health into stroke prevention guidelines.”
Detailed information is available on the American Heart Association’s website
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