Olaplex No.3 Bond Perfector is designed for at-home use to help maintain the structure, integrity, softness and shine between salon services. Our patented technology relinks the broken disulfide bonds in every type of hair providing real, structural repair that works from within.within.Apply a generous amount to towel-dried hair and comb through.Leave on for a minimum of 10 minutes. Keep in mind, the longer it's on, the more effective it is.Rinse, shampoo and condition. This is NOT a conditioning treatment OR a leave-in treatment. It is meant to be shampooed out of the hair. No.3 must process a minimum of 10 minutes. If hair is compromised, 20 mins is recommended. Once a week is suggested for healthy hair. For those with compromised hair, we recommend 2-3 times a week in combination with your favorite moisture and protein treatments where applicable.