Blondie,
I tried this right after it came out. It was okay for about the first week. Then it got to where I couldn't stand it in my mouth. I didn't finish the last few days of it so I can't tell you if it really whitens like it should or not. On the other hand, I have also used the Crest White Strips. They have worked. They really aren't that bad. My dentist even noticed. He asked what I had been using to whiten my teeth. I told him and he was very interested in how you use them. By the way, he also told me that you can get the same stuff that he uses for whitening at Sally Beauty Supply. He said that the teeth trays were kind of cheesy but the stuff you use in them was exactly the same for about a tenth of the price he has to charge. It cost about $35 according to him.