Olaplex No.4 Bond Maintenance Shampoo. A highly concentrated, color-safe shampoo designed to repair, strengthen, and nourish all hair types. Key features and benefits of Olaplex No.4 Bond Maintenance Shampoo: Repairs and Strengthens: It utilizes Olaplex's patented bond-building technology to repair and protect hair from damage, split ends, and frizz by relinking broken bonds within the hair structure. Nourishing and Hydrating: It gently cleanses without stripping natural oils, providing hydration and leaving hair smoother, shinier, and more manageable with each wash. Suitable for All Hair Types: While particularly beneficial for damaged, bleached, or chemically treated hair, it's formulated for daily use and can be used on all hair types.