There are numerous methods of hair removal on the market today, and laser hair removal can achieve permanent removal. Hair follicles and hairs are rich in melanin, the use of specific wavelength laser irradiation, the color base of the absorption of light waves will produce energy to make the surrounding hair follicle tissue destruction, the hair will not be able to grow, this is the principle of laser hair removal. As hair grows in different stages, and the laser only works on the hair follicles in the anagen phase, it often takes several treatments to achieve the goal of permanent hair removal. Generally speaking, armpit and limb hairs need 4~6 times, female lip hairs need at least 5 times or more due to half of the hair follicles are smaller, and the treatment interval is about 1 month, and those with thick hairs need more times than normal people. It is recommended that patients who are willing to undergo treatment go to a regular medical institution to receive treatment and follow the instructions to do a good job of post-treatment care.