Calcium in water can further damage already delicate over-processed or bleached hair. Being more porous, damaged hair can absorb up to three times more calcium than natural hair. This haircare duo are formulated with a concentration of pure citric acid and glycine to decalcify hair from calcium overdose, visibly repair, and reduce the appearance of stiffness and dullness. Set Contents: Kérastase Première Decalcifying Repairing Pre-Shampoo Hair Treatment for Damaged Hair with Pure Citric Acid and Glycine 250ml Kérastase's first pre-shampoo hair treatment removes excess calcium and helps visibly repair all types of damaged hair, including damage by heat tools, colour treatment, bleaching and over-processing. With its transparent gel texture, this pre-treatment helps visibly repair persistent damage to leave hair feeling stronger, healthier-looking, and shinier. Kérastase Première Decalcifying Repairing Shampoo for Damaged Hair with Pure Citric Acid and Glycine 250ml Suitable for all hair types, the shampoo removes excess calcium and helps visibly repair all types of damaged hair, including damage by heat tools, colour treatment, bleaching and over-processing. This professional-level shampoo gently cleanses the scalp and hair while removing excess calcium, which further weakens treated hair. Use the full routine to help repair hair from the inside out, reduce breakage and restore a healthy feel to the hair. The creamy shampoo transforms into a luxurious foam, with its dual-action formula targeting the calcium overdose from hard water to leave hair feeling smooth, manageable and bouncy.