Takes at least 2 to 3 applications before you can really see results but once you do you will be amazed. My dentist is very impressed with the results and she does professional whitening. I find the results last a long time and then just need a touch up every now and then. I am very happy with these and recommend them constantly.

Thanks for the quick reply. That's a good tip about touching up every now and then. I think I am going to give the Crest Whitestrips a try. My husband wants to use them too. Lets see who's teeth get whiter :)