L'Oréal Professionnel Liss Unlimited Shampoo is used to discipline hair for 4 days*. This shampoo for dry and frizzy hair provides up to 96 hours* of frizz control, and smoothens dry, unmanageable hair, leaving it shinier and softer.*Instrumental test: shampoo + conditioner / mask + leave-in vs. classic shampoo.**Instrumental Test: Shampoo + Mask + Serum vs. Non-Conditioning Shampoo