Olaplex No.0 is an intensive professional bond building treatment recommended for all hair types: straight, wavy, curly, and coily hair. It contains the highest concentration of the patented bond building technology of any Olaplex at home product which allows to prime the hair for deeper repair while rebuilding hair bonds, strengthening, and protecting hair integrity. When used together at-home with No.3 Hair Perfector your hair will experience 68% more repair and become 3 times stronger after just one use. It can be used at home as part of two step system once to three times per week on damaged hair.