What is the role of dental procedures in infective endocarditis?

• A. They can cause endocarditis in all patients.
• B. They have no effect on bacteremia.
• C. They reduce the risk of infection.
• D. They can introduce transient bacteria into the bloodstream.

Answer: (D)

The key idea is that dental procedures can cause transient bacteremia by pushing bacteria from the mouth into the bloodstream. The mouth harbors oral bacteria, especially viridans streptococci, and manipulating gums or teeth can let these organisms enter the circulation. If someone has a damaged or prosthetic heart valve, these circulating bacteria can adhere to the endocardium and potentially establish an infection, leading to infective endocarditis. That’s why this mechanism is the best answer: dental work can briefly introduce bacteria into the bloodstream, which is the step that links dental procedures to endocarditis in susceptible individuals.

They don’t cause endocarditis in everyone, bacteremia is usually temporary and cleared by the immune system, and dental procedures aren’t inherently protective—they don’t reduce risk except in the context of selective prophylaxis for high-risk patients.