No. 0 Intensive Bond Builder - Our professional-inspired treatment primes your hair for deeper repair, rebuilds hair bonds, strengthens, and protects hair integrity. Use as the first step in a two-part at-home system with No.3 Hair Perfector (sold separately) to strengthen and repair all types of damaged hair. No. 3 Hair Perfector Take Home - A weekly at-home treatment, not a conditioner, that reduces breakage and visibly strengthens hair, improving its look and feel. Clients can benefit from this global bestseller whether or not they receive chemical services. No. 4 Bond Maintenance Shampoo - A highly moisturizing, reparative shampoo that leaves hair easy to manage, shiny and healthier with each use. N°4 is color-safe, sulfate-free, and proven to reduce breakage and strengthen all types of hair. No. 5 Bond Maintenance Conditioner- A highly-moisturizing, reparative conditioner for all hair types that leaves hair easy to manage, shiny and healthier with each use. N°5 is color-safe, leaves hair stronger than ever, and benefits all hair types and textures.