A Recent Study Links Flossing to Reduced Stroke and Heart Arrhythmia Risk

A recent study presented at the 2025 International Stroke Conference by the American Stroke Association has revealed that regular flossing—at least once a week—can significantly reduce the risk of stroke and heart arrhythmias, such as atrial fibrillation (AF). This finding highlights the connection between oral health and cardiovascular health.

Study Details

The research analyzed data from over 6,000 participants in the Atherosclerosis Risk in Communities (ARIC) study, which began in 1987. Participants completed detailed questionnaires about their oral hygiene habits, including flossing frequency, tooth brushing, and dental visits. Over a 25-year follow-up period, the study recorded 434 cases of stroke and 1,291 cases of AF among the participants.

Key Findings

The analysis revealed that individuals who flossed at least once a week had:

• 22% lower risk of ischemic stroke (caused by a blocked artery in the brain).
• 44% lower risk of cardioembolic stroke (caused by blood clots traveling from the heart to the brain).
• 12% lower risk of developing AF, a common heart arrhythmia that increases stroke risk.

These benefits were independent of other oral hygiene practices, such as regular brushing and dental visits.

Proposed Mechanisms

Researchers suggest that flossing helps reduce plaque buildup and food debris between teeth, lowering the risk of inflammation and oral infections. Chronic inflammation in the mouth can contribute to arterial hardening and narrowing, increasing the risk of stroke and heart disease. Therefore, maintaining good oral hygiene could be an effective strategy to reduce these risks.

Study Limitations

It is important to note that the study relied on self-reported data, which may introduce biases. Additionally, while the study found a significant association between flossing and reduced stroke and AF risk, it does not establish a direct causal relationship. More research is needed to confirm these findings and better understand the underlying mechanisms.

Conclusion

Incorporating flossing at least once a week into a regular oral hygiene routine is a simple, affordable, and accessible practice that could have significant cardiovascular benefits. This habit, along with regular brushing and routine dental visits, may help prevent strokes and heart arrhythmias, contributing to better overall health.