Olaplex no. 0The Olaplex No. 0 Hair Treatment is recommended as the first part of a two part treatment, paired with the Olaplex No. 3 Hair Perfector to help strengthen and repair all types of hair. Designed to complement each other, this system works to restore the hairs healthy appearance and texture by working to repair damage and protect hair structure. For best results, use once a week or two to three times a week for damaged hair.