Laser hair removal uses a scientific principle called selective photothermolysis or SPTL. A concentrated beam of light is used to burn the follicle that creates hair. The beam of light is moved over the skin to target areas of high pigmentation and heat them to the point that the hair follicle is destroyed and unable to grow new hair. Laser hair removal is a popular choice for hair removal because it is fast, efficient and can be done on large areas of the skin.