This product rules, whitens teeth with no sensitivity! If used correctly you will not have a flat painful crest whitestirp white but 360 degrees of whitening!
This device works well. I used it for the maximum 10 days consecutively to bring my teeth up to the whitest level they are capable of.
Ordered this system, regular price $275. The applicator brushes (for applying the bleach ingredient) dried up quickly, which is my only complaint.
The activating "solution" is sticky do it stays on your teeth and in cracks well, but it also ends up sticking in the container and sometimes the brush comes off in the container.