No.4 Bond Maintenance Shampoo
250ml
 
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 colour-safe and proven to reduce breakage and strengthen all types of hair. 

PH Balance: 6-6.5
 
How - Use every time you shampoo, or after rinsing Olaplex no 3 from hair. Follow with Olaplex no 5 bond maintenance conditioner.
Where - Concentrate on roots.
When - Formulated for daily or every wash use.
For - All hair types, especially those needing clarifying or oil control.