These prefilled trays, worn 45 minutes a day for one week, ranked tops on whitening; on average, all teeth got two shades whiter, based on tests done by the Good Housekeeping Research Institute. Some consumer testers found trays messy or uncomfortable.
For easy, effective whitening, try Good Housekeeping Seal holder Crest 3D White Advanced Vivid Whitestrips with Advanced Vivid Technology. Wear them once per day for 30 minutes for two weeks—you should start to see a difference in three days.
The most expensive (about $200), this kit claims to lighten teeth up to six shades after just one 30-minute session. While some consumer testers didn’t like holding the light, at least half were satisfied with the degree and speed of the whitening.
This tooth-whitening stick, which promises to lighten one shade in just two minutes (no rinsing required), visibly lightened the teeth of two-thirds of participants, according to tests done by the Good Housekeeping Research Institute beauty lab.