Anyone had this? My gums sting/tingle like crazy but it comes and goes and I still can't figure out what the problem is. At first I thought stress/hormones but then I started suspecting my toothpaste (Sensodyne gentle whitening) although it doesn't happen until a while after I brush. I switched back to Colgate which helped a bit but I just used some orajel tonight for a small area that was hurting and within 20 mins my whole mouth was tingling/hurting again. The only ingredient I can see in both is sodium saccharin and I think that's in all toothpastes, including Colgate. So I'm stumped. Has anyone else ever had a reaction to toothpaste or orajel?