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?