29/03/2026
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American researchers studied oral bacteria discovering novel role in cardiovascular disease prevention.
Dental bacteria were thought merely responsible for cavities, but American scientists at Johns Hopkins discovered that specific oral bacteria directly prevent cardiovascular disease through metabolic contributions. People with diverse oral microbiota—particularly Streptococcus sanguinis and Actinomyces species—have 50% lower heart disease risk compared to those with depleted oral microbiota.
The mechanism involves oral bacteria producing compounds that circulate systemically: some protective (nitric oxide-producing bacteria reduce blood pressure), while pathogenic bacteria produce trimethylamine increasing atherosclerosis risk. The balance between protective and harmful oral bacteria directly affects cardiovascular outcomes. Maintaining diverse, healthy oral microbiota prevents heart disease at multiple mechanistic levels.
Remarkably, dental flossing and healthy mouth flora correlated with heart disease prevention better than most pharmaceutical interventions. The mechanism works through oral bacteria producing anti-inflammatory metabolites circulating through bloodstream and directly affecting vascular function. Poor oral health—indicating depleted protective bacteria—increases cardiovascular risk as much as smoking.
Periodontitis (gum disease from dysbiotic oral microbiota) increases heart attack risk 3-fold through chronic bacteremia (bacteria in blood) triggering systemic inflammation and infection. Treating periodontal disease through oral hygiene and bacterial rebalancing reduces heart attack risk profoundly. Cardiovascular medicine increasingly recognizes oral health as foundational.
Clinical applications include oral probiotic treatments: applying beneficial oral bacteria through lozenges or rinses promotes protective microbiota. Early trials administering oral probiotics to patients with gum disease prevented periodontal progression and improved cardiovascular markers. Prevention of cardiovascular disease through oral bacterial management offers low-cost, side-effect-free intervention.
Source: Johns Hopkins University, Circulation Research 2025
