Olaplex No 4 Maintenance Shampoo is a daily cleansing and repairing shampoo that imparts deep moisture and strength to damaged bonds. Its unique patented active ingredients works on the molecular level- seeking out damaged bonds in the hair (usually caused by colouring, heat styling and general wear-and-tear) to restore the damaged hair to its former glory.Looks are certainly deceptive with the chic, minimalist packaging of Olaplex No 4 Maintenance Shampoo as this has been hailed a miracle product that’s goes beyond a hair treatment, OLAPLEX’s three-step ritual is a system that permanently rebuilds the damaged disulphide bonds in your hair.Olaplex No. 4 Bond Maintenance Shampoo formula is colour, sulphate, paraben, gluten ,nut free and is also vegan-friendly.Apply to damp hair, work through hair from root to tip creating a lather. Wash off then follow with the {No 5 Bond Maintenance Conditioner}. Can be used alongside the weekly {No 3 Hair Perfector} treatment.