Only problem with this theory was that there wasn't a hole at the back of my mouth where the wisdom tooth used to be. It had healed up rather nicely.
So I finally went to the dentist today to have him figure it out. He couldn't see anything wrong, and I hadn't had one of those pains since before I left for Florence. He decided that the most likely explanation was that I had a slight tooth fracture, and every once in a while I was eating something in such a way that it would jar the fracture, causing the pain. Then, since I would change my eating habits to accomodate the pain, the tooth would heal up a little, nd all would be well until the next time I did something to it. Since the pain is happening so infrequently, there wasn't much he could do about it. He said to come back if the pain every got to the point where it was happening every two weeks or so, and they might put a crown on it.