I wish I could give it ZERO stars
I used these as directed, and not only did they burn my gums and hurt the nerves in my teeth, they did not really whiten. Instead, they created small white dots on my teeth that look absolutely ridiculous. I now have to go to a dentist to have a professional whitening done to REVERSE the damage done by this product. I am asking crest for my money back. This has been nothing but a PAIN...literally! I guess a few lucky people did have this work for them, but I'd suggest going to a professional instead.Good luck with this product. I hope it will work better for you than it did for me!