- Strengthens, softens, and neutralizes unwanted yellow tones - Hydrates and brightens; the longer you treat, the brighter the results - Powered by Olaplex's patented Bond Building technology, it helps repair broken hair bonds and restore damage - For all blonde, lightened and grey hairOLAPLEX No.4P Blonde Enhancer Toning Shampoo Read The Beginners Guide to Olaplex here Read Rachels product review of OLAPLEX No.4P here   Read Julie's product review of OLAPLEX 4P Here   The best-selling Olaplex shampoo has now been formulated to suit blondes. Olaplex No.4-P Blonde Enhancer Toning Shampoo strengthens, softens, and neutralizes unwanted yellow tones for brighter, more manageable hair. With all the benefits of the original shampoo, this toner will keep your blonde hair looking salon fresh in-between visits to the hairdressers. The sulfate-free, highly concentrated formula allows for customizable toning - The longer you treat, the brighter the results. Whether your blonde comes natu