Hello, laser hair removal in beauty salon. Laser selectively absorbs laser with specific wavelength through melanin in hair follicle, and exchanges heat energy to destroy hair follicle. Laser energy can enter the hair follicle along the hair shaft, and the hair follicle is destroyed by energy, so that the hair stops growing. Because the energy of this laser is about 15-20%, it can penetrate the dermis of the whole skin, so it selectively damages the epidermis and hair follicles with deep melanin, which makes the hair follicles degenerate and shrink, and achieves the effect of permanent hair removal. I hope it helps you!