Q. I have bridge that was replaced by my general dentist last year. Since then, I had a lot of problems because when the molar (#31) was grind down, it exposed the nerve. I had root canal done. However, after the rct, I was still having pain. The endodontist told me she was not able to get through one of the canals because it was blocked & curved. I went to another endodontist who recommended a retreatment. The tooth feels a little better, with some sensitivity. The bridge is always getting loose because there is not much tooth to hold the bridge. My dentist is recommending a crown lengthening. I am afraid I am spending too much money on this tooth, but would it really be worth it.