Laser hair removal uses light to target the pigment in individual hairs. The light travels down the shaft of the hair and into the hair follicle. The heat from the laser light destroys the hair follicle, and a hair can no longer grow from it.
Hair follows a unique growth cycle that involves resting, shedding, and growing periods. Recently removed hair that is in a resting phase will not be visible to the technician or laser, so a person may need to wait until it regrows before removing it.
For most people, laser hair removal requires several treatments over the course of 2 to 3 months.