Olaplex No.4 Bond Maintenance Shampoo - 250ml For all hair types, especially those needing clarifying or oil control. Olaplex No.4 Bond Maintenance Shampoo is a highly-nourishing and reparative shampoo. N°4 Shampoo repairs and protects hair from everyday stresses — including damaged hair, split ends, and frizz — by re-linking broken bonds. Leaves hair easier to manage, shinier and healthier with each use. N°4 is color-safe and proven to reduce breakage and strengthen all types of hair. PH Balance: 6-6.5 Free of DEA, Aldehydes and Formaldehyde Use Concentrate on roots. Formulated for daily or every wash use.