Laser hair removal is permanent when the hair follicle is destroyed. When the hair follicle is only damaged, the hair will eventually regrow. The amount of time it takes for the hair to regrow depends on the person's unique hair growth cycle. 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. For most people, laser hair removal requires several treatments over the course of 2 to 3 months.