If they ran tests and everything looked fine, it could have been an allergy. I had the same problem as a kid and the culprit was food coloring. I haven't had candy, Hawaiian Punch, Twinkies, etc since I was in the 1st grade. NO HAWAIIAN PUNCH!? I'm sorry, but that's not a life worth living... But also never had a cavity. I'm beginning to see some advantages... On a serious note, did you/your parents figure this allergy out on your own, or did you have to see a doctor to figure it out? I was constantly sick as a little kid and they didn't know why. Keep in mind that my family was poor as church mice in those days, so not the best medical care. In the 1st grade there was one of those end of the school day kiddie birthday parties with store bought cake and a gallon of that orange drink crap. By the time my mom came to get me I was breaking out in hives and my tongue was swelling. I got a shot of adrenalin in my ass at the hospital, went to see an allergist the next day and the rest was history. Not coincidentally, I really never get sick as an adult and I have all of my teeth in great shape at 41.