The Kérastase Resistance Soin Premier Thérapiste is a reconstructing pre-shampoo treatment designed to deeply repair and revitalize damaged hair. This advanced formula works to rebuild the hair fiber from within, targeting split ends and weakened strands. It prepares the hair for shampoo, enhancing its resilience and smoothing the cuticle for improved texture and shine. Ideal for very damaged and over-processed hair, it restores strength and vitality, leaving hair feeling soft, supple, and rejuvenated.