Q. I had a filling put in my very back tooth about 6 weeks ago. Ever since then I keep a terrible aching in jaw whenever I chew, although the pain is under a tooth that was not fixed. It is actually under a crown. It is sensitive to hot and cold. I went back to the dentist this week and he adjusted the bite, but it is still causing some pretty terrible aching pain. HELP! The dentist did an xray and said everything looked fine for all the teeth on that side.,