Mitral valve regurgitation is very common. Regurgitation means leaking backwards through the valve. If the leak is small (as is most commonly the case) it really is not a concerning issue. It only becomes an issue if the heart begins to fail from a large leak.
It is recommended that people with mitral valve regurg. take endocarditis prophylaxis. This means that before certain procedures that can introduce bacteria into the blood stream, such as dental work or cleanings, you should take an antibiotic. Just one dose before these procedures is usually enough. Your regular doctor can prescribe this for you.
Advice and opinions given are based on the information provided and must not be considered an official medical recommendation. The limitations of the internet prevent an appropriate evaluation. Always consult your doctor if there is concern.