The laser emits a beam of light, which the pigment (color) in the hair absorbs. With time, This could damage the hair follicle, Hence the hair can't grow back again. While it's going to take about 6 treatments from the dermatologist to destroy a follicle, the hair will increase again https://www.finditguide.com/united-states/north-las-vegas/sos-wax-and-skincare