I was given this teeth whitening system to try.
The foam system is quite ingenious and is supposed better for your teeth than the usual white strips.
After brushing your teeth regularly, you are supposed to pump formulas 1 and 2 onto your toothbrush and brush again for 1 minute. This is done twice a day for 1 month, after which you use the maintenance formula (sold separately) that lasts up to 3 months.

The foam did give me that clean "just came home from the dentist" feeling, and kept my teeth shiny with minimal plaque after an entire day. It is a really great feeling.
The biggest thing I have against this product is that because I have quite sensitive gums, brushing my teeth four times a day made them irritated and swell a bit, and it hurt to brush my teeth for a while. I used it on and off for a bit because of this.
My teeth are pretty white to begin with, so I don't think I saw much of a difference, but it might just be because the change is so gradual that you don't notice. I really do love that clean feeling though, and will continue to use it!