Choice of 1, 2, 3 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. This protocol involves the carefully controlled use of a relatively high-concentration peroxide gel, applied to the teeth by the trained technician.