I'm just estimating how much I've spent on this tooth. I had a root canal and a cap and then a few years later another root canal. I think these fixes let me keep the tooth an extra 7 years. Anyway, today when I went for my cleaning and check-up the dentist said the second root canal has failed and his advice would be to let the tooth go, so Thursday I'm going to the place he referred me to have it out. They estimate it will cost between $100 and $195. I hope they plan to give me a shot. When I had the second root canal that dentist (not my regular guy) said I didn't need a shot since the tooth had had a root canal. I insisted on a shot anyway and he acted like I was crazy. I was there because I was in pain so it didn't make sense that I didn't need a shot. I'm going to insist on a shot Thursday, too.