I agree, White Strips worked great for me. Here is a link to an informative explanation of the difference between the Crest whitening products. This is one of the Amazon pages but if you scroll down to the second review it's by a dentist.
Hi, I went to Nancy's link and I'm glad I did. I was on day 5-ish of a box of strips and had a nagging feeling about the sensitivity. It's good to hear a dentist's point of view. Thanks!
Thanks Nancy--that page helped me a lot AND there are many different types to choose from. As soon as my teeth get sensitive--I stop and start again when they feel better. Hope they worked, Lisa.