Laser hair removal involves the use of a laser device that emits a certain wavelength of laser light that penetrates the skin to the location of the hair follicle and acts on the root of the hair follicle, causing it to absorb the energy and be destroyed. The damaged hair follicle root can’t grow new hair again because of the shrinkage of the tissue, which makes the hair fall off. Nowadays, laser hair removal is getting more and more recognized by everyone, after several treatments can achieve long-lasting hair removal effect, and the specific number of treatments is related to many factors such as skin condition, hair removal area and the type of hairs. Most patients need 3-5 sessions to achieve permanent hair removal, and some patients with heavier hair even have more sessions. This is because there are three phases in the hair growth cycle, including the anagen phase, the anagen phase, and the resting phase. Laser hair removal can only effectively get rid of hair in the anagen phase, and these three growth cycles of hair exist at the same time, therefore, to achieve complete hair removal, it must go through a number of courses of treatment, that is, hair removal should be divided into phases. It is recommended to choose a regular medical institution for laser hair removal treatment in order to obtain good hair removal results and reduce the riskiness.