Kérastase Première Reparative Pre-Shampoo TreatmentThe Benefits: 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 hairs 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