Olaplex No 4, a fantastic addition for the backwash. Elevate clients results with this effective shampoo in a helpful pump dispenser. Repairing, strengthening and hydrating, this product supports the professional treatments of No.1 bond multiplier and No.2 bond perfector.

Stylists can apply a small amount of the shampoo, lather and rinse every time they wash clients’ hair. Follow with No.5 bond maintenance conditioner for maximum results.