Choice of 1, 2 or 10 teeth whitening treatments. Benefits:Teeth whitening helps to restore a smile tainted by discoloration. In-office teeth whitening produces the fastest results and is the safest form of teeth whitening. How it works: Significant color change in a short period of time is the major benefit of in-office whitening. Generally, the peroxide remains on the teeth for several 15 to 20 minute intervals that add up to an hour at most. Those with particularly stubborn staining may be advised to return for one or more additional bleaching sessions, or may be asked to continue with a home-use system. The option for 10 may be split between up to 3 different family members.