This simple daily habit can significantly lower stroke risk

By MDLinx staff | Fact-checked by Davi Sherman

Published February 6, 2025

Key Takeaways

Industry Buzz

"We’ve kind of known about this for awhile but it’s good to have more evidence… The bacteria in your gums [can] get into your bloodstream through inflamed gums where, they can contribute to more inflammation and atherosclerosis." — Dr. Amir Khan

Emerging research has found that a simple, often-overlooked oral hygiene practice may play a significant role in improving heart health.

As it turns out, everyone’s least favorite part of their dental hygiene routine—flossing—can significantly reduce the risk of certain types of strokes.^[]

About the study

The research, which included data from over 6,000 participants in the Atherosclerosis Risk in Communities (ARIC) study and a follow-up period of 25 years, found that individuals who floss at least once a week experienced a 22% lower risk of ischemic stroke, a 44% lower risk in cardio-embolic stroke, and a 12% lower risk of AFib incidence.

Researchers assessed various factors, including oral hygiene behaviors, cardiovascular risk factors, and other preexisting health conditions. Notably, the association between flossing and reduced stroke risk remained significant even after adjusting for confounding variables such as regular tooth brushing and dental visits.

Why flossing matters

The proposed mechanism behind this association centers on the prevention of periodontal disease and cavities through flossing.

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Dr Amir explains the simple thing you can do that may reduce your risk of a stroke by more than a fifth, according to scientists. 🦷
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Flossing helps remove interdental plaque, thereby reducing the risk of infection and inflammation, which is known to contribute to atherosclerosis.

This aligns with the broader understanding of the oral-systemic health connection, where periodontal pathogens and inflammation have been implicated in cardiovascular diseases.

What the study can’t tell us

While these findings are compelling, it's important to recognize the study's limitations. The reliance on self-reported flossing frequency may introduce recall bias, and the observational nature of the study precludes establishing causation.

Nevertheless, given the low cost and minimal risk associated with flossing, incorporating this practice into daily routines could serve as a practical adjunctive measure in stroke prevention strategies.

As healthcare professionals, encouraging patients to adopt regular flossing habits may offer an accessible means of mitigating stroke risk. This recommendation should complement, not replace, established preventive measures such as blood pressure control, lipid management, and lifestyle modifications. Further research, particularly randomized controlled trials, is warranted to elucidate the causal pathways and confirm these observational findings.