Association Between Oral Health and Coronary Artery Disease
Yes, poor oral health is associated with coronary artery disease, though the relationship appears stronger in women and may be partially confounded by smoking in men.
Evidence for the Association
The most recent and highest quality evidence demonstrates a clear link between poor oral health and CAD:
In the 2022 Paris Prospective Study 3, middle-aged individuals with poor oral health and severely impaired masticatory capacity had more than twice the risk of incident coronary heart disease (HR 2.47,95% CI 1.34-4.57) compared to those with optimal oral health, even after adjusting for traditional cardiovascular risk factors including smoking, diabetes, hypertension, and lipid profiles 1. This prospective study of 5,294 participants followed for over 8 years provides the strongest evidence for a dose-response relationship.
The 2026 Swedish CCTA study found that missing teeth was an independent risk indicator for subclinical coronary artery atherosclerosis (OR 1.15,95% CI 1.04-1.27), with the association particularly pronounced in women where adding oral health data improved risk prediction models significantly (AUC 0.67 vs. 0.78, p=0.010) 2.
Critical Confounding by Smoking
A major caveat: The 2018 Korean Cancer Prevention Study of nearly 1 million people revealed that in men, the relationship between tooth loss and CAD was completely eliminated when restricting analysis to never-smokers (HR 1.01,95% CI 0.85-1.19), suggesting the association in men may be entirely due to smoking confounding 3. However, the association persisted in women who never smoked (HR 1.08,95% CI 0.99-1.18).
Guideline Recognition
The 2015 AHA/IDSA guidelines explicitly state: "Poor oral hygiene and periodontal diseases, not dental office procedures, are likely to be responsible for the vast majority of cases of infective endocarditis that originate in the mouth" 4. While this addresses endocarditis specifically, it underscores the importance of daily oral hygiene maintenance.
The 2012 European cardiovascular prevention guidelines recognize periodontitis as associated with endothelial dysfunction, atherosclerosis, and increased risk of myocardial infarction and stroke, though acknowledge confounding factors like low socioeconomic status and smoking play significant roles 5. Treatment of periodontitis improves endothelial dysfunction, one of the earliest signs of atherosclerosis 5.
Specific Oral Health Markers Associated with CAD
Multiple studies identify these specific indicators:
- Missing teeth: Strongest and most consistent predictor across studies 2, 1, 6
- Periodontal probing depth ≥6mm: Associated with both stable CAD (OR 2.44) and acute coronary syndrome (OR 2.75) 7
- Severe alveolar bone loss: Associated with acute coronary syndrome (OR 5.39) 7
- Number of stenosed coronary arteries: Linearly associated with bone loss, missing teeth, and deep periodontal pockets 7
Potential Mediating Mechanisms
The 2026 English Longitudinal Study found that depressive symptoms mediate approximately 27% of the association between poor oral health and CVD 8. This suggests the relationship operates through multiple pathways beyond direct inflammatory mechanisms.
Clinical Implications
For risk stratification: Consider oral health status, particularly in women, when assessing cardiovascular risk. The number of missing teeth provides a simple, objective measure that independently predicts CAD risk.
For prevention: While the causal relationship remains uncertain due to confounding, maintaining optimal oral health through daily hygiene is emphasized by cardiovascular prevention guidelines 5. This is more important than antibiotic prophylaxis for dental procedures in preventing cardiovascular complications.
Sex differences matter: The association appears more robust and clinically meaningful in women than men, where smoking confounding may account for much of the observed relationship 3, 2.
Remaining Uncertainties
The observational nature of all available evidence precludes definitive causal conclusions. No randomized trials demonstrate that improving oral health reduces cardiovascular events. The relationship likely reflects shared risk factors (smoking, socioeconomic status, health behaviors) rather than direct causation, though inflammatory and microbial mechanisms remain plausible 6.