Works great, but burned the skin in my mouth
I first used these about a year ago and loved them.  So I ordered them again this year.  I don't know if the formula charged or I did.  I've been using it just once a day for less than a week, and my teeth do look whiter, but now I have to stop because it has burnt the skin inside my mouth.  Since the chemical is on both sides the insides of my lips were exposed to it.  The skin is now all peeling and hurts.
Rating: 1 stars