I was wondering if I should be worried about developing an infection from a cavity that I have on one of my molars. I have had this same cavity for over 2 years now. It started out as what I thought was just a spec on my tooth because it wasn't getting any larger. Well now it has grown, but the cavity itself has remained the size that it is now for quite some time now. Any way, the reason I am worried is because there is already a filling on the tooth that that cavity is on. The cavity is to the left of the filling, and it feels large, but when I look in the mirror, it doesn't look as large as it feels. The cavity itself doesn't look horrendous, but I just worry what will happen.
I have heard that if something like this happens, then they have to take the filling out and do a bunch of other stuff to it as well. I'm just scared that I might swallow some of the mercury, or they have to pull it, etc. Or I possibly have an infection or will develop one. If I forgot to mention the cavity is on the top of the tooth, and doesn't reach the sides at all or touch the filling. It's almost like a perfect circle on my tooth.