I have two teeth, one right above another, that were root canaled two years ago. They should be dead, as there are no longer any roots in them. Why do they still hurt? I had a crown installed on the top tooth three weeks ago, it still hurts when I eat hot or cold foods. The bottom tooth just sits there pounding away to it's own drummer. Why? There is nothing to bother it, whatsoever! It didn't hurt at all until the tooth filling shifted and broke...she had to drill it out and refill it. No sweat...hey, she didn't even have to tranquilize me for that job! So what's with all the hurting now? How to I stop the hurting? No way can I afford a bottom crown right now!