The Concentré Dédcalcifiant Ultra-Réparateur Première is a highly concentrated pre-shampoo with pure acids that has a dual action of decalcifying and repairing for all damaged hair. It removes excess calcium, responsible for hair breakage, on the surface and internally, and rebuilds the internal bonds of the fiber*. For an even more effective result, we recommend layering it with the Bain Réparateur Dédcalcifiant.