The Hair Perfector No°3 by OLAPLEX contains a one-of-a-kind, patented active ingredient that permanently repairs damaged hair. Hairdressers can confirm that chemical applications such as bleaching or colouring, as well as the use of heat from blow-dryers, flat irons or UV rays, strain the hair. This causes damage to the structure of the hair, loss of shine and smoothness ultimately leading hair to becoming brittle. OLAPLEX permanently repairs the hair from within providing long-term resilience and restoring natural shine. It is highly effective on colour-treated and bleached hair as well as damaged hair. Application: It is recommended to use OLAPLEX N° 3 once a week to repair the hair and optimally prep it for the next chemical application. Massage liberally into towel-dried hair and distribute evenly with a comb or brush. Leave on for 10 minutes then rinse thoroughly with water. Follow with the OLAPLEX n° 4 Shampoo and OLAPLEX N° 5 Conditioner for best results.