An Olaplex treatment is a professional bond-building service for the hair, designed to repair and strengthen strands that have been weakened by colouring, bleaching, heat styling or general wear. It uses a patented active ingredient (bis-aminopropyl diglycol dimaleate) that works inside the hair to help relink the broken disulfide bonds that give hair its strength and structure. Unlike a simple conditioner, which mainly coats and smooths the surface, Olaplex aims to rebuild the internal framework, so hair typically feels stronger, looks shinier and is less prone to breakage.