Human hair is divided into different growth cycles, and the growth cycle of hair is divided into growth period, transition period and rest period. Laser hair removal is only suitable when the hair is growing. If the hair is in the growth period of other states, laser is ineffective in destroying the hair growth environment, so it is necessary to carry out laser hair removal for many times, so as to ensure the hair removal effect.

HR808 laser hair removal uses the "selective photothermal effect" of laser to directly irradiate hair follicles with laser with a specific wavelength through the epidermis. Laser can pass through the skin surface to reach the hair follicle at the root of the hair, and the light energy is absorbed and converted into heat energy that destroys the hair follicle tissue, thus inactivating the hair follicle and melanocytes without damaging the surrounding tissues.