Long hair is usually caused by heredity, if you feel that it affects your beauty, the most common and effective clinical method is to take laser for permanent hair removal, but due to the different length, density, color and treatment area of the sweat hair, it will have an impact on the treatment effect, and usually can not be permanently removed at one time. Laser can only act on the hair follicles in the anagen phase, which can destroy the hair follicles and make them no longer grow hair. In the same area, some hair follicles will be in the anagen phase, and a small portion of them will be in the anagen or resting phase, so more than one course of treatment will be able to destroy all the hair follicles in the anagen phase. The number of treatments varies from area to area. Lip hair usually requires 3-4 sessions, armpit hair may require 4-6 sessions, and leg hair may require more sessions. Generally speaking, after several laser or intense light treatments, the hair removal rate can reach 90%, and even if there is hair regrowth, it will be very fine, soft and light in color. In addition to laser hair removal, there are conventional methods such as shaving, waxing, medication, etc. Although sweat hair can be removed within a short period of time, it may cause the subsequent growth of hardened hair, coarsening of pores, etc. Improper operation may also cause damage to the surface skin or cause folliculitis, and some of these methods may cause strong pain, so the clinical application is currently less. Laser hair removal is a less painful, faster and more effective way of hair removal, and it can be used to remove hair permanently, so it is recommended to be used in clinical practice.