I had a root canal done on my next to last tooth on the bottom right years ago. Then I received a crown. The crown fell out a few years later. Then I had something called an apicoectomy on that same tooth which involved them taking one of the roots because it went bad. After that they put a second crown on and eventually that one came out and they said there wasn't enough of a root/tooth to hold the crown any longer so they wanted to do a bridge. I forget now how much it was but I did not have that kind of money. Right now I just have a hole and a few nubs of a tooth back there. I will eventually get what is left pulled. Dentistry just costs way too much these days! I don't miss that tooth. I just chew on the other side. Hope this helps!