It is an excellent hair straightener with an exclusive formula that transforms hair from roots to tips. The duration of the procedure is from 3 to 6 months. Use: Apply a deeply cleansing shampoo on moist hair and gently massage the scalp, length and tips. Reapply and leave on the hair for 3 minutes to fully open the cuticle. Wash thoroughly. If necessary, repeat the procedure two to three times.