Ditch the shaving supplies and think about laser hair removal! The more treatments, the less hair will ultimately come back. Hair grows in cycles. Some hair follicles are actively growing while others remain in a dormant phase. The laser or IPL hair removal eliminates only hair follicles in the active growth phase. Approximately four weeks later, additional hair follicles enter the growth phase. Usually 4 to 6 sessions, 4 to 6 weeks apart, are necessary before all hairs can be treated.