A new study suggests that using dental floss at least once a week may lower the risk of stroke and a common heart rhythm disorder called atrial fibrillation. Researchers from the University of South Carolina presented their findings at the International Stroke Conference 2025, organized by the American Stroke Association. Dr. Souvik Sen, head of the neurology department at the university, emphasized that oral health issues affect nearly 3.5 billion people globally, making it one of the most widespread health concerns. The study followed over 6,000 participants for 25 years and found that regular flossing was linked to a 22% lower risk of ischemic stroke and a 12% lower risk of atrial fibrillation. The research also explored the connection between oral hygiene and brain health. A separate Japanese study suggested that gum disease and tooth count might be indicators of cognitive decline, though the relationship was not straightforward. Sen’s team aimed to identify which oral care practice—brushing, flossing, or visiting the dentist—most effectively reduced stroke risk. Over the study period, more than 400 participants experienced a stroke, and nearly 1,300 developed atrial fibrillation. Dental infections are thought to allow harmful bacteria to enter the bloodstream, potentially increasing the risk of heart and other systemic diseases. Toxins from untreated cavities or gum disease can travel through the blood, contributing to cardiovascular issues. The study confirmed that flossing helps prevent cavities and gum disease by removing plaque and food particles from between teeth—areas that a toothbrush cannot reach. Experts at the American Association for the Advancement of Science (AAAS) annual conference noted that good oral hygiene may be linked to a lower risk of several serious conditions, including arthritis, Alzheimer’s disease, and heart disease. These findings highlight the importance of maintaining oral health not only for dental well-being but also for overall systemic health.