I don't often get toothaches; when I do, they've never been due to cavities or any actual dental phenomenon. They've always been sinus-related.
I happen to have a doctor's check-up tomorrow morning; if it still hurts, I'll be sure to let him know and see what he thinks.
This assumes I can actually get to sleep -- all those cartoon-sitcom cliches about Toothaches Driving You crazy have their roots in reality. This is one of the most UNIGNORABLE pains I've ever experienced.