Specially formulated with lower sulfates, TRESemmé Keratin Smooth Shampoo helps restore keratin and nourishes each strand to leave hair gorgeously straighter, shinier and more manageable. When used together with Keratin Smooth Conditioner, it controls frizz for up to 48 hours and transforms your hair to be gorgeously straighter, more manageable and easy to style. How to use: Apply to wet hair, gently massage and work into a lather. Rinse thoroughly. How it works: For straighter & smoother hair.