Olaplex No 4 Bond Maintenance Shampoo is used for strengthening the hair. It is a luxurious, reparative shampoo enriched with the patented OLAPLEX Bond Building Technology. Designed to gently cleanse without stripping essential moisture, it helps hydrate, nourish, and strengthen the hair from root to tip. This sulphate-free, colour-safe formula improves manageability while restoring shine and softness to all hair types, especially damaged or chemically treated hair. It lathers richly, leaving the hair feeling clean, smooth, and visibly healthier with each use.