If you receive the recommended number of treatments for your skin and hair type, you can expect to achieve 80% to 90% permanent hair reduction. However, there is always the chance that hairs which may have been dormant during your laser treatment will begin to grow. Additionally, hormone changes with time or changes in health or medications may affect hair growth. Many patients find that maintenance sessions done once or twice a year after completing the initial treatment protocol is ideal for keeping unwanted hair away.