The Olaplex No. 0 Intensive Bond Building Treatment is a professional, at-home treatment designed to intensely repair, strengthen, and rebuild broken disulfide bonds in the hair. This intensive formulation works synergistically with other Olaplex treatments to deliver significant repair benefits. It primes the hair by deeply penetrating strands to repair damage caused by chemical processes, heat styling, and mechanical stress. Use this treatment as the first step in a two-part system for maximum bond-building efficacy. It is ideal for all hair types, especially those experiencing structural weakness or frequent damage.