Poor Oral Health May Nearly Double Stroke Risk, Study Finds
Having both gum disease and cavities may significantly increase the chances of experiencing an ischemic stroke, according to a long-term study involving nearly 6,000 adults.
Key Takeaways
- Individuals with both gum disease and cavities had an 86% higher risk of stroke compared to those with healthy oral conditions.
- Poor oral health was also associated with a 36% increase in major cardiovascular problems, including heart attacks.
- People who visited the dentist regularly were 81% less likely to have both gum disease and cavities.
Researchers suggest that improving oral hygiene could be an important, yet often overlooked, way to help lower stroke risk.
The research, published October 22, 2025, in Neurology Open Access, examined how oral health impacts the likelihood of ischemic stroke the most common type, caused by restricted blood flow to the brain.
Cavities develop when bacteria wear down tooth enamel, while gum disease (periodontal disease) involves inflammation or infection of the gums and supporting bone. When untreated, gum disease can lead to tooth loss and chronic inflammation, which may influence cardiovascular health.
“We found that people with both cavities and gum disease had almost twice the risk of stroke compared to those with good oral health,” said lead author Dr. Souvik Sen from the University of South Carolina. “This suggests that better oral care may be an important piece of stroke prevention.”
How the Study Was Conducted
- Participants: 5,986 adults, average age 63, none with a prior stroke.
- Timeline: Tracked over 20 years through exams, interviews, and medical records.
Results:
- 4% of those with healthy mouths experienced a stroke
- 7% of those with gum disease only had a stroke
- 10% of those with both gum disease and cavities suffered a stroke
Even after adjusting for factors like age, weight, and smoking, the stroke risk remained higher among those with poor oral health.
Why It Matters
The findings highlight that dental care is not just cosmetic it may play a role in protecting the heart and brain. Regular brushing, flossing, and dental checkups could be practical steps to reduce stroke and heart disease risks.
“This study reinforces that caring for your teeth and gums isn’t only about maintaining a nice smile,” Sen emphasized. “It may also support long-term brain and heart health.”