Q. I recently had to get a bridge because I had a primary tooth K but no adult tooth behind it. I am 48 years old and managed to keep tooth K for 48 years – it did have a cavity and a filling and it finally got to the point that the tooth had to come out because there was not enough of the tooth left to replace the filling that had fallen out. While working through the bridge process, I ended up needing a root canal on the back molar that the bridge was to be anchored to. Since that tooth also had a cavity and filling, I could understand the need for a root canal. But now 6 months later, the dentist says I need a root canal on the front bicuspid tooth on the other side of the bridge – the other anchor tooth. This tooth did not have a cavity or filling and was a perfectly healthy tooth prior to the bridge. Could the dentist have cut down the tooth too much and damaged the nerve, in other words, is the dentist the cause of needing a second root canal on a tooth that was perfectly healthy before? Thanks for any advice.