K18 Leave-In Repair Hair Mask Treatment to Repair Dry or Damaged Hair - 4 Minutes to Reverse Hair Damage from Bleach, Color, Chemical Services and Heat, A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. BENEFITS Reverses damage in 4 minutes SUGGESTED USE Shampoo, skip conditioner. Towel-dry, apply 3-9 pumps of K18 mask. Wait 4 min, do not rinse. Use for 4-6 washes.