Dental procedures and infective endocarditis
- Mouth and systemic disease
Mouth bacteria can infect heart valves. Daily oral health matters more than antibiotics before procedures, which are given only to the highest-risk patients.
What it is
Viridans group streptococci from the mouth are a classic cause of infective endocarditis on abnormal or prosthetic heart valves. Bacteria enter the blood not only during dental procedures but many times a day with chewing and brushing, especially when the gums are inflamed. For this reason current guidelines from American and European cardiology societies restrict antibiotic prophylaxis before dental procedures to people at the highest risk of a bad outcome, and stress good oral hygiene and regular dental care for everyone with heart disease. The procedures concerned are those that manipulate the gingiva or the periapical region, or perforate the mucosa.
Oral findings
- Highest risk: prosthetic heart valves or valve repair with prosthetic material, previous infective endocarditis, certain congenital heart diseases (unrepaired cyanotic, or repaired with prosthetic material in the first months or with residual defects), and, in some guidelines, heart transplant with valvulopathy.
- Prophylaxis is not recommended for other valve diseases (for example mitral valve prolapse or bicuspid aortic valve without prior endocarditis) under current guidelines.
- Procedures: extractions, scaling, periodontal surgery, root canal beyond the apex; not routine anaesthetic injections through uninfected tissue or radiographs.
- Daily bacteraemia from poor oral health is a larger cumulative risk than single procedures.
- When guidelines differ, follow the more cautious national or local recommendation.
What the doctor does
- Fever, new murmur or embolic signs weeks after dental work or with poor dentition: take blood cultures before antibiotics.
- Treating fever with oral antibiotics before blood cultures can mask endocarditis.
- Patients at highest risk should have dental assessment before valve surgery.
Next step / Initial management
- Identify highest-risk patients and give them a written note for the dentist.
- Refer all patients with significant heart disease to the dentist every six to twelve months for preventive care.
- Suspected endocarditis: at least three sets of blood cultures before antibiotics and urgent referral.
Test yourself
Think of the answer, then tap the question to see it.
Which oral bacteria classically cause infective endocarditis?
Viridans group streptococci.
Which patients receive antibiotic prophylaxis before dental procedures under current guidelines?
Those at highest risk: prosthetic valves or valve repair with prosthetic material, previous endocarditis, and specific congenital heart diseases.
Why is daily oral hygiene emphasised over prophylaxis?
Because chewing and brushing with inflamed gums cause frequent bacteraemias that add up to a greater risk than single procedures.
Connections
In Pharmacology3
Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once.
Sources: Infective Endocarditis (StatPearls Publishing (NCBI Bookshelf), 2026); Antibiotic Prophylaxis in Dental and Oral Surgery Practice (StatPearls Publishing (NCBI Bookshelf), 2026).
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Representative model, for educational purposes only.