Laser teeth whitening is normally done in three 20-minute bleaching treatments.  With laser teeth whitening treatments you are able to walk out of the dental office with your teeth a lot brighter.  With laser bleaching, a barrier is put around the gums and a strong bleach is put on your teeth.  A laser light is used to activate the bleach to make it work.  A down side of laser teeth whitening treatments can be the cost since laser whitening is the most expensive of the teeth-whitening options available.