Olaplex - NO.0 Intensive Bond Building Hair Treatment 155 ml Olaplex NO.0 Intensive Bond Building Hair Treatment is an extraordinary and effective treatment for the hair. Olaplex NO.0 Intensive Bond Building Hair Treatment acts as a primer, and is designed to be used in conjunction with the regimen, although it also works alone. This treatment provides a deeper repair, and penetrates and rebuilds the hair's sulfur bonds, as well as strengthens and protects the hair's integrity. Olaplex products can be used on all hair types, but the more damaged hair you have, the more dramatic results you will experience. It works inside the hair, and the more often you use it, the healthier your hair will be.