I had to have two white fillings re-done because of leakage, one molar on the top, one molar on the bottom. The top one was very sensitive to cold and it had a constant throbbing pain that would wake me up at night if I didn't take any asprin for it. My dentist sent me to have it evaluated for a root canal and I didn't end up needing one and the pain eventually faded away after 2 weeks or so.
The bottom one, however is also very painful, but in a different sort of way. It is very tender when I clench my teeth together, but when I chew something, or tap my teeth, it sends a severe sharp pain through the tooth and it is always constantly in pain if I don't take asprin. I went back to my dentist twice, he said it wasn't infected and that I needed to go back to the root canal guy. It was a deeper filling, but not that deep, so why would I need a root canal? I think he doesn't want to deal with me anymore but my tooth really really hurts! He put me on antibiotics, but it hasn't affected anything. Any advice??