That's fairly brilliant, coming up with the possibility that the tooth might be causing your headaches. The Sparrowhawk had a nagging tooth that turned out to have a cyst underneath it. He regularly got headaches that he thought were sinus, and they sort of were, because the cyst was poking up into his sinus. After they removed the cyst and built him a tooth implant to replace the bad one, the headaches went away. I don't know if that's your problem, but it's worth checking out.