I had the ZOOM teeth whitening treatment done at my Dentist's office in June. (If it is helpful, the price was $480 and included the take home tray & whitening solution.) My teeth ended up ~3 shades whiter, however, I was disappointed that my teeth were still not "movie star" white. The Dental Assistant told me that I would need to use the take home trays to further improve my results, and also use whenever I felt like I needed a touch up. My boss only uses Crest White Strips, and her teeth are super bright white. Therefore, if I were to do this all over again, I would certainly try the Crest White Strips first....it is way less expensive as well.