Olaplex No.5 Conditioner is part of the 3-4-5 system to repair hair weakened by chemical treatments, hair color or styling tools. Formulated with Bond Building Chemistry to restore broken disulfides bonds, this treatment repairs and moisturizes without weighting the hair down. After each use your hair will become shinier, stronger and healthier. For best results, start with Olaplex No.3 Apply No.4 shampoo on wet hair, then emulsify Rinse thoroughly Follow with Olaplex No.5 Leave to act for 1-3 minutes, then rinse