Straightened hair should use L'Oreal Professionnel Xtenso Care Shampoo. The L'Oreal Xtenso Shampoo, enriched with innovative Pro-Keratin and Incell technology, reconstructs and protects the core of hair fibre while adding volume to the strands. L'Oreal Xtenso Care Shampoo's anti-dryness action allows it to cleanse straightened locks with care while keeping moisture levels. Apply Xtenso Care Mask & Serum after using L'Oreal Xtenso Care Shampoo for optimum results.