Revive extremely damaged hair with Kérastase Resistance Sérum Thérapiste, a powerful repairing hair serum designed to restore, hydrate, and protect. Formulated for normal hair types, this serum penetrates deep into the hair fiber, reinforcing strength while sealing moisture for a silky, healthy finish. With advanced 450°F thermo-protection, it shields hair during heat styling, minimizing breakage and split ends caused by blow-dryers, flat irons, and curling tools. The lightweight, non-greasy formula absorbs quickly, leaving hair soft, smooth, and manageable without weighing it down. Perfect for over-processed, chemically treated, or heat-damaged hair, Sérum Thérapiste is your go-to defense against everyday stressors.