Olaplex No.0 Intensive Bond Building Hair Treatment is a professional-grade primer designed to repair and strengthen hair from within. This 3.3 fl oz treatment works by penetrating deeply to rebuild broken bonds, preparing hair for enhanced repair with Olaplex No.3. Ideal for all hair types, it helps reduce breakage, improve texture, and restore resilience, leaving hair healthier and more manageable. Use as the first step in your hair care routine to maximize the benefits of bond restoration.