I had a root canal done on this tooth two years ago and then a bridge placed over it. I've had trouble with it ever since, about ever 4 to 6 months he has to open it back up, I've had that done 5 times and I get charged 600 dollar every time, can he charge me everytime for the same thing? Anyways I'm at my wits end with this and I don't know what to do about it. I had it done again last Monday and I still had the pain. Please give me any advice and tell me if the doctor can keep charging me for the same thing?