At any one time, not all hair follicles are ‘active’, and only active hair follicles can be affected by the treatment. ‘Inactive’ hair follicles can be treated as they become ‘active’ over time. For IPL treatments, an average of 8–10 treatments, 4-6 weeks apart, are required to remove most visible hair. Today, many laser clinics around the world categorically remove all hair 'permanently'; to quote SkinteX Laser Clinic in Scotland, UK (multiple award-winners), who state "unfortunately many operators do not understand the physics nor how the hair grows, and are unable to fully remove hair, whereas we do and only perform permanent hair removal, not 'partial' or 'temporary' hair removal". SkinteX maintain an average of only 6 treatments for total efficacy, instead of the former 8-10, because of their unique methods of increased fluence with additional cooling.