Any permanent hair removal method can not be achieved at once, and several treatments are needed. Because the hair in each part is in different growth stages, the proportion of hair in the anagen stage is different in different parts, usually, about 20-70% of the hair is in the anagen stage, after that, it enters the transition stage and resting stage. The laser works only on the hair in the anagen phase, that is, only on the part of the hair that is visible on the body surface, but not on the resting hair. After each treatment, it takes 1 to 1.5 months for the resting hair to grow out before the second hair removal. Therefore, one treatment cannot solve the problem completely. Usually 4-5 waxes can reduce the hair by more than 90%. Therefore, several treatments are usually required. Semiconductor laser hair removal does not affect other functions of the skin such as perspiration, sebum secretion and sensation. Because semiconductor laser hair removal uses specific wavelength laser (800nm), which is targeted to melanin, it will not be absorbed by other skin appendages such as sweat glands, sebaceous glands and internal tissues such as nerve lymph, so it will not affect sweating, sebaceous secretion, nerve sensation and other functions, which is the safest and most effective hair removal technology nowadays.