root canal....

[alvinasd]

I had a root canal when I was about 12, i couldnt get a crown for it because the dentist said that it could burst because my moler was still growing. My dentist told me to wait until i was about 17 to get a crown, but now sometimes i get this painful throbing feeling it starts small then after and hour or 2 it hurts more it last for 1 to 2 days sometime little longer. I want to kno what i should do about it, if its an infection how do i get rid of it? (by the way im 14 now)