Description: The daily cleansing and restoring shampoo Olaplex No. 4 is a silky fluid that deeply moisturizes and strengthens the hair, as well as restores damaged bonds between the hair in between salon visits. The formula of the No. 4 Bond Maintenance Shampoo is sulfate-free, paraben-free, gluten-free, and nut-free, making it suitable for vegans. Use after the weekly treatment {No. 3 Hair Perfector} from the brand, and then apply {No. 5 Bond Maintenance Conditioner}.