Olaplex No 4 Bond Maintenance Hair Shampoo is a highly nourishing and reparative shampoo developed with patented bond building technology to effectively cleanse, hydrate and protect hair. It contains Bis-aminopropyl diglycol dimaleate that works at a molecular level to improve hair strength, repair damage and protect hair. It strengthens and adds shine to damage-prone hair as it gently cleanses. Hair structure depends on disulfide bonds which can be broken by heat styling, coloring, chemical treatments, brushing or environmental factors, leading to dry, frizzy and brittle hair. This color-safe shampoo repairs broken bonds and restores healthy hair effectively. The rich lather nourishes and repairs to leave hair smoother and more manageable. It is recommended to pair with the corresponding conditioner for softer, shinier, healthier-looking hair. Studies showed 90% smoother hair, better detangling, more conditioning and 49% reduction in breakage.