Review (1/5): Caution
I used (1) of my 10. I am typically decent with pain and do not complain. This product hurt my teeth so bad! I have never had sensitive teeth. I would be ok if after the pain lasted an hour or so........ My teeth were still hurting so bad hours later. I just could not believe it was still hurting many hours later. Now I am stuck with an expensive whitener I cannot use.. Any suggestions offered as to how maybe I can build-up my teeth prior to trying this again??