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. \n \n-Treat hair with No. 3 (sold separately). \n-Apply and massage product throughout hair. \n-Rinse product from hair. \n-Follow with No. 5 Bond Maintenance™ Conditioner (sold separately). \n \nWhich hair type is it good for? \n✔ Straight \n✔ Wavy \n✔ Curly \n✔ Coiled \n✔ Tightly Coiled