A professional-inspired treatment that primes and nourishes hair for maximum repair. This salon-level treatment primes hair for deeper repair with the highest dose of the brand's patented molecule, Bis Aminopropyl Diglycol Dimaleate. It rebuilds bonds and protects hair's resiliency. Use as the first step in a two-part system with the best-selling No. 3 Hair Perfector, which reduces breakage and strengthens strands. Designed for all hair types, especially those with visible damage. - This treatment includes: No. 0 Intensive Bond Builder and No. 3 Hair Perfector. - Ideal for repairing chemical, thermal, mechanical, and environmental damage. - Paraben-free. Phthalate-free. Gluten-free. Nut-free. Cruelty-free. pH-balanced. - Free of DEA, aldehydes, and formaldehyde.