Water is good for you. But not so great for your hair. The calcium in your shower water can lead to persistent hair damage leaving it rigid, dull & brittle. This powerful system removes calcium build up that causes damage and restores up to 99% of hair’s original strength*. It repairs persistent damage, reversing stiffness and dullness for 75% more shine**. For 93% less breakage***, it reinforces weak hair bonds and reconnects broken links between keratin chains*. Ultimate treatment that repairs persistent damage Reverses stiffness and dullness for more shine Reinforces weak hair bonds and reconnects broken links between keratin chains* InStyle Best Beauty Buys Awards 2024 Winner Awarded People En Español Star Product Awards 2024 *with continuous use of the system **vs. unwashed hair *** vs. non conditioning shampoo Anti-Breakage Stronger Hair Shiny Hair . | Kérastase - Concentré Décalcifiant Ultra-Réparateur Repairing Pre-Shampoo Treatment