Millions of adults have gum disease, but many do not realize that it is more than a dental problem.
Gum disease happens when harmful bacteria grow around the teeth and gums. Over time the gums become swollen, sore, and may bleed easily.
If the infection continues, bacteria can enter the bloodstream and travel to other parts of the body. Researchers have long suspected this might affect the heart, but exactly how has remained unclear.
A new investigation has now provided an important clue. Scientists studying heart valve disease found that a bacterium commonly linked to gum disease may help start a chain of events that leads to calcium building up in the aortic valve.
The aortic valve opens and closes every time the heart beats.
When it becomes thick and hard because of calcium deposits, blood cannot flow properly. This condition, known as calcific aortic valve stenosis, becomes more common with age and often requires open-heart surgery or a replacement valve once it becomes severe.
The researchers studied samples taken from patients during heart valve replacement operations.
They compared valves affected by calcific aortic valve stenosis with valves removed for other reasons.
One bacterium, Porphyromonas gingivalis, stood out because it was much more common in the calcified valves. Although it was not the most common bacterium overall, the difference between the two groups was striking.
To understand whether the bacteria could actually contribute to disease, the team performed laboratory studies in mice. Repeated exposure to living bacteria caused the microbes to collect in the heart valves.
The valves became more heavily calcified and showed changes similar to those seen in human disease. The scientists also discovered that the bacteria activated a strong inflammatory response involving a protein called interleukin-1 beta. Blocking this pathway or preventing infection with antibiotics greatly reduced the damage.
These findings suggest that inflammation caused by chronic gum disease may slowly damage heart valves over many years. While people should not assume that every case of gum disease will lead to heart valve disease, the research strengthens the growing idea that oral health is closely connected with overall health. Healthy daily habits such as brushing, flossing, and seeing a dentist regularly may protect much more than just the teeth.
The research was presented at the American Heart Association Basic Cardiovascular Sciences Scientific Sessions 2026. Because it was presented at a scientific meeting, the findings are considered preliminary and have not yet gone through the full peer-review process of a journal publication. The researchers have already begun a clinical study to find out whether the same link exists in people.
Overall, this study provides an interesting new explanation for how poor oral health might contribute to heart valve disease. The experiments in mice and human tissue make the findings stronger, but they do not prove that gum disease directly causes calcific aortic valve stenosis in people.
More clinical research is needed before doctors can recommend new treatments based on these results. Even so, the study adds to growing evidence that keeping the mouth healthy may also help protect the heart.
Good brushing, flossing, regular dental check-ups, and early treatment of gum disease remain important steps for overall health.
If you care about heart health, please read studies about the best time to take vitamins to prevent heart disease, and scientists find how COVID-19 damages the heart.
For more health information, please see recent studies about Aspirin linked to higher risk of heart failure, and results showing Blackcurrants could improve artery functions, blood pressure in older people.
Source: Chinese Academy of Medical Sciences.
