Olaplex No.4 Bond Maintenance Shampoo 250ml. Repairs and maintains bonds within the hair. Eliminates frizz and flyaways. Reduces breakage. Paraben-Free. Sulfate-Free. Phthalate-Free. The Olaplex No.4 Bond Maintenance Shampoo uses patented technology to re-link broken disulphide bonds, strengthening dry, brittle and breakage-prone hair.. A nurturing bond-repairing shampoo for hair weakened by frequent colouring, bleaching, chemical treatments and heat styling. Reinforcing the hair structure, the colour-safe shampoo thoroughly cleanses and leaves hair with silky-softness and shining.. Restore moisture and maintain healthy hair at home with this saviour shampoo.