Works good
I've been a smoker for 28 years, drink too much soda. Whitening strips never seemed to do much but I could definitely see a difference. It says to use 2 times a day, I used it once a day and saw results after a week. Towards the last 2 days of use though I did develop some pain and small sores, maybe chemical burns. I stopped for a few days and it has improved and I will go back to using it again.
Rating: 5 stars