Available as the take-home portion of the OLAPLEX System, No.3 Hair Perfector enables the maintenance of strong, healthy hair in between professional services. This home treatment can be used with or without the salon service, and features the same patented ingredient as No.1 and No.2. This revolutionary component, Bis-Aminopropyl Diglycol Dimaleate, works by finding single sulfur hydrogen bonds and cross-linking them back together to form disulfide bonds. Disulfide bonds are broken through chemical procedures such as colouring, thermal interference like heat and UV damage, and mechanical processes like brushing and combing. With this single active ingredient repairing and reinforcing the hair fibre, the result is stronger and healthier hair with enhanced colour longevity and vibrancy. No.3 Hair Perfector works to repair the external structure of the hair when left on for a minimum of 10 minutes. The longer it is left in the hair, the more effective it will be.