1 teeth whitening Session 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 after the gums have been protected. Generally, the peroxide remains on the teeth for several minutes. Those with particularly stubborn staining may be advised to return for one bleaching sessions,