on the right side of my mouth my first moller going to the back, has had a porcillian crown on it for at least 4 years now.. i never had any problems with it bothering me until recently when i noticed a bump, a hard bump on my jaw line....not on my gums but on my jaw line...it feels like bone.... i dont know what it is or what it means!!! and ever since i have noticed that my tooth also seems to be sensitive to the touch as well....does anyone know what this might be??? or anything similar to it??