Analysis: Laser hair removal is based on the principle of selective photothermal kinetics. By reasonably adjusting the laser wavelength and energy pulse width, the laser can pass through the skin surface to reach the hair follicle at the root of the hair, and the light energy is absorbed and converted into heat energy that destroys the hair follicle tissue, thus making the hair lose its regeneration ability without damaging the surrounding tissues and causing slight pain. Laser hair removal is the safest, fastest and most lasting hair removal technology at present.