Laser hair removal is to use a laser with a specific wavelength to penetrate the epidermis and directly irradiate the hair follicle. Melanin in hair follicle and hair shaft selectively absorbs light energy, which leads to hair follicle necrosis and axillary hair no longer grows.
Laser hair removal generally takes about 3 times, depending on the density of individual armpit hair. If you still have questions you don't understand, you can click on the name below the answer, and I will give you detailed answers online.