There are three general methods of hair removal, one is physical hair removal —— using adhesive tearing or plucking, electrolysis and thermal dissolution, the second is chemical hair removal —— chemical ointment to dissolve the hair root and then wipe it away, and the third is selective photothermal action —— laser or photon hair removal. No matter which method is used, if the hair is not removed through the regular way, accidents may happen. Common problems after improper hair removal are —— light hair regrowth, or skin allergies, skin burns, clogged pores, and permanent scars in severe cases. The most effective, convenient, safe and permanent method to remove body surface hair is the use of modern optical technology, taking a variety of laser systems and intense pulsed light source (photon) systems for hair removal. The principle of laser or photon hair removal is based on the theory of selective photothermal action of laser or photons. The hair follicle and hair shaft are rich in melanin, which is distributed between the cells of the hair bulb matrix and can also be transferred to the structures of the hair shaft (such as the medulla, cortex and hair microdermis). The laser can target melanin precisely and selectively for hair removal treatment. The melanin absorbs the energy of the laser and the temperature rises dramatically, removing the hair. It also allows people to undergo extensive hair removal treatments with less discomfort and with minimal scar formation and other complications. Permanent hair removal and reduction has been achieved using modern optical technology. Because of the clear targeting of lasers and photons, it only hits the hair follicle without harming other accessory tissues of the skin, and therefore, does not affect the sweating function of the sweat glands. Laser hair removal is the most advanced once-and-for-all hair removal method available. Since the laser penetrates the skin’s surface layer, the epidermis absorbs very little of the laser’s energy and therefore does not produce hyperpigmentation. At the same time, the new patented sapphire contact treatment head can effectively reduce the epidermal temperature, so that the treatment can achieve the purpose of hair removal. Generally speaking, the human hair state is three growth cycles coexist, so to achieve the effect of hair removal, you need to receive more than 3-5 times of treatment, in order to achieve the best hair removal effect in the basic long-term.