I can share my own experience with tooth pain which may at least shed some light, though I don't have all the answers either. I too have had similar pains and also problems with acid. I finally figured out that the acid is splashing up into the jaw area causing the tooth and head pains. My dentist does not agree with this assessment, but I am 100% sure. I noticed that when I had reflux symptoms going on in the esophagus area, that is when I'd get the tooth/jaw/head pains. I have quite a bit of erosion from acid on my teeth, (which the dentist does agree with) so it does not surprise me that acid would also be involved in the pains. And, I have read that acid can cause sinus issues, so . . . I should also note that x-rays did not show any other reason for the tooth/jaw pain and I do not have any tmj or grinding issues. I got reflux mostly when I had candida flares or was going through a detox, and I detox top-down (in other words, with a candida flare, once I would begin to detox from the flare, first the sinuses would inflame and then drain, and the my throat would get sore from the drainage and then heal, and the my bronchia would get inflamed and then heal, and then finally my esophagus and stomach would inflame and get "acidy", and that is when I'd notice the tooth/jaw pain. It was worse when I'd be walking form some reason. Then when the flare was out of my system, no more tooth pain. Weird, huh?