New research presented at the American Heart Association’s Basic Cardiovascular Sciences Scientific Sessions 2026 adds evidence to the link between oral health and heart disease, suggesting that the bacterium Porphyromonas gingivalis may play a role in calcific aortic valve stenosis (CAVS).
Study finds gum‑disease bacteria in calcified heart valves
Investigators measured bacterial levels in aortic valve tissue removed from patients undergoing valve‑replacement surgery. The samples were compared with valve tissue from patients treated for other cardiac conditions. Although P. gingivalis was not among the most abundant microbes overall, it showed one of the largest differences between valves with CAVS and those without the disease.
“We were surprised by how much P. gingivalis was present in the calcified aortic valves,” said Dr. Chenyang Li, a cardiology professor at Fuwai Hospital in Beijing. “This unexpected finding led us to investigate its potential role in the development of CAVS.”
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Using mouse models, the team exposed animals to either live or heat‑inactivated P. gingivalis. Some mice received preventive antibiotics, while others were genetically engineered to lack the IL‑1β inflammatory pathway. Repeated exposure to the bacterium resulted in calcium buildup within the aortic valves and symptoms consistent with aortic stenosis. Mice lacking IL‑1β showed markedly less valve calcification, even when the bacteria were present.
Implications for treatment and prevention
There are currently no approved medications that can halt or reverse CAVS. Dr. Li emphasized that the findings could spur new preventive strategies, noting that “good oral hygiene and treatment of periodontal disease are important for overall health and may also have benefits for cardiovascular health.” The researchers cautioned that it is still premature to recommend specific dental interventions to prevent valve disease, but they highlighted the potential of periodontal health as a factor in a broader disease‑prevention framework.
Oral health matters.
In a separate line of inquiry, researchers at the University of Minnesota reported a method to suppress harmful plaque bacteria without destroying beneficial microbes. Their work showed that interfering with bacterial “quorum‑sensing” signals can tilt the oral microbiome toward a healthier composition. While that study focused on plaque trends rather than heart outcomes, it illustrates a growing interest in targeting oral bacteria to improve systemic health.
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Comparing these findings to earlier work on atherosclerosis, the new data suggest a more direct pathway from gum infection to valve calcification. Past studies have shown that oral bacteria can enter the bloodstream and adhere to damaged arterial sites, promoting inflammation that contributes to plaque formation. The current research extends that concept to the aortic valve, indicating that bacterial colonization may trigger calcium deposition in a similar inflammatory environment.
Although the mouse experiments provide a mechanistic glimpse, human confirmation is still needed. If future clinical studies validate the association, dental professionals might be called upon to screen for cardiovascular risk factors in patients with severe periodontal disease. Likewise, cardiologists could consider oral health assessments as part of routine evaluations for patients at risk of valve degeneration.
“While it is still too early to recommend specific treatments for preventing CAVS, our findings suggest that periodontal health could be an important piece of the puzzle,” Dr. Li concluded. The researchers hope that their work will encourage interdisciplinary collaboration and more extensive investigations into how oral microbes influence heart valve pathology.
