Review (1/5): WARNING; beware product
I used the strips as directed for five days and the teeth were whitening. No problems except excessive drool and unpleasant removal of remaining strip at end of thirty minutes.
Then at the end of the fifth day's use there were two chemical burns, each just under a half inch diameter each, on the inside of my lower lip. I stopped use and called the company. They were polite and apologetic giving me a complete monetary refund. HOWEVER, it was a painful week before the sores healed especially the first two days when eating was difficult.
I would definately not recommend the strips, even if this was a rare occurance.[[ASIN:B000067E30 Crest Whitestrips Dental Whitening System, 56 Strips]]