A. Professional bleaching is far superior in every way. For lightening several shades in one session, safely and conveniently, nothing compares to Philips Zoom in-office whitening. You can leave our office with a dramatically brighter smile over your lunch hour. However, if gradual results are desired, professional at-home kits can offer more comfort, strong active ingredients, and a predictable, even result. The supervision of a dentist is strongly recommended to protect against tooth sensitivity and damage to gum tissue.