Review (3/5): The strips stay on pretty well. Also
I did NOT receive this product as a promotion in exchange for my review.
These strips whitened my teeth about three shades, from about a "10" to a "7" on the chart that's included. Not a dramatic difference, but a noticeable one. I did not mind the heavier (than Crest strips) residue that some other reviewers complained about; it wasn't hard to get rid of with one brushing after use. The strips stay on pretty well. Also, I had no tooth pain as I did with Crest strips. In fact, I can't actually compare the results w/Crest, because I never finished the full round of the Crest strips because of tooth pain. That was some years ago; I don't know if they've altered their formula since.
For the price, which is between one half and one third what you'd pay for a name brand, I think these whitening strips are worth it. They are pretty much what my three stars say: OK.