Depending on the area being treated, the process may take anywhere from several minutes to 30 minutes. The most commonly used lasers utilize a low energy laser beam. This beam passes through the skin and is attracted to the pigment of the hair. The energy passes down the hair shaft and is absorbed by hair follicles that are in the active growth phase, thereby disabling the hair follicle in the deeper layer of the skin. The hair follicles that are in dormant phase are not affected by the treatment. With the NEW LightSheer Duet, no anesthesia is required.