Basically, when you put chemicals in the hair — from coloring, or peroxide developers, or straightening treatments — the sulfur bonds split, and they then become sulfur hydrogen." This process can eat away at the hair proteins, which causes damage. Olaplex prevents the splitting from happening. In short, "It links [together] broken bonds in the hair caused by chemical processes...preventing them from damage.”
Olaplex Hair Perfector No 3 Repairing Treatment - his treatment, often applied at salons, will rebuild the bonds inside of your hair," Olson explains. It also lowers your hair's pH, which closes the cuticle and prevents your hair from drying out, which would cause further damage.