Step 1: Treat Before you wash your hair, apply No.0 slowly to dry hair, distributing evenly from root to tip and working into small sections by squeezing the liquid into the hair to be fully absorbed as you go until hair is damp, not drenched. Let process for 10 minutes. DO NOT RINSE. Follow directly with No.3. Apply generously to damp hair from scalp to ends until hair is thoroughly saturated. Leave on for a minimum of 10 minutes (or longer if desired). Then, rinse well. Step 2: Cleanse Lather and massage No.4 Bond Maintenance Shampoo into wet hair concentrating on the roots. Rinse well and follow with Olaplex No.5 Bond Maintenance Conditioner Step 3:Hydrate After cleansing with Olaplex No.4 Bond Maintenance Shampoo, apply a generous amount of No.5 Bond Maintenance Conditioner from root to tip. Leave on for 3 minutes, then rinse.