17 years ago I broke a large piece of my tooth and ended up having to get a root canal performed. My dentist at the time drilled out the area that had broken and put a filling in place, and within a day I was ready to knock the tooth out myself. He set up an emergency appointment for me to get a root canal done the following Monday. Everything went according to plan, with the exception of getting a crown put on the tooth. I don't know what the likelihood is of anyone else having a root canal with an exposed filling, but I do since I couldn't afford the procedure the first time. My problem is this: 12 years ago, I saw a dentist who informed me that there was a hairline fracture in the filling. I had felt some odd pains in this tooth before that was ever mentioned, and I thought it was strange to have pain in a tooth with no nerve or pulp in it. As I have gotten older, the tooth is still there, without a crown or anything to cover it, and it seems to be holding up well. My problem now, however, is that about once a week, the tooth in question begins to throb like a toothache, sending sharp pains into my jaw and ear. I have a high pitched ringing in my ear ever since I had this root canal done, and I'm wondering what exactly I should do once again.