Use OLAPLEX N3 (100ML) as a weekly pre-shampoo treatment to repair and shield hair from breakage, damage, and split ends. OLAPLEX N4 (250ML): shampoo for maintaining bonds. strengthens, nourishes, and repairs all varieties of hair. OLAPLEX N5 (250ML): conditioner for bond maintenance. strengthens, nourishes, and repairs all varieties of hair.