The process takes only 30-minutes, (2 – 15-minute applications) to achieve a whiter and brighter smile. It is broken down into two 15-minute applications to allow for maximum gel concentration and light exposure, without being under the light for too long of a period to cause gum irritation. Results from whitening vary from person to person and on the type of stains. Individuals with sensitive teeth may reduce the intensity of the bleaching unit by choosing a lower power setting and those with very heavy stains may need additional treatments.