The Nº.4 Bond Maintenance Shampoo, infused with patented OLAPLEX Bond Building Technology, is a highly concentrated reparative shampoo that hydrates and nourishes hair. The Nº.4 Bond Maintenance Shampoo improves manageability and softness. It increases shine and leaves hair looking healthier and helps prevent breakage and split ends. How to Use: 1. Dispense desired amount of product into hands and emulsify. 2. to wet hair, focusing on the scalp and working through to ends. 3. Rinse. 4. For best results, follow with OLAPLEX Nº.5 BOND MAINTENANCE CONDITIONER. Questions? Please leave a comment below.