Tylenol does very little for pain, it is best for fevers - due to concerns over rye syndrome related to aspirin. Motrin is a better pain reliever. My daughter LOVES the taste of the tylenol too, and I have had those same concerns that she asks for it b/c it tastes good. Luckily, she hasn't had much pain getting the 6yo molars. Try motrin, and maybe pick one that is not his favorite flavor (if they offer more than one).