not all heart murmurs are organic. some are innocent so you need to find out what type of murmur you have. strep throat often cannot be avoided so you will need to discuss if prophylactic antibiotics are recommended for you if you are exposed or if you were to undergo dental procedures. if the answer is "no" then you need to only worry about strep throat if you get it.
is it true if you have a heart murmur you should be careful not to get strep throat?