Olaplex N 4 Bond Maintenance Shampoo is a shining shampoo for all hair types. The only professional shampoo able to guarantee a reconstructed hair action. Restores the strength and internal hydration of the hair for incredible shine and manageability. Olaplex N ° 4 is the shampoo thanks to which you can take care of restoring your hair even at home, not only during salon treatments! Formulated with the exclusive Bis-Aminopropyl Diglycole Dimeleate ingredient, Olaplex N ° 4 restores the strength and internal hydration of the hair for an incredible shine and manageability. The active principle patented by Olaplex makes each of the products, including this shampoo, the only ones in the world capable of reconnecting sulfur bridges (bisulphide bonds) broken inside the hair due to coloration, heat, continuous exposure to chemicals and various mechanical stresses.