No.0 This treatment primes your hair for deeper repair, rebuilds hair bonds, strengthens, and protects hair integrity. Use as the first step in the multi system treatment  to strengthen and repair all types of damaged hair. How to Use Apply No.0 to DRY hair, fully saturating each section. Let process for 10 minutes. DO NOT RINSE. Apply No.3 Hair Perfector over hair with No.0 applied to it, combing through as needed. Let process for a minimum of 10 minutes. Rinse, shampoo & condition. For best results, use No.4 Shampoo & No.5 Conditioner followed by no.6 bond smoother and no. 7 bonding oil. Product Tip Brush or detangle hair before applying No. 0 so it can easily be absorbed. For thick, coarse, or long hair, work in small sections to ensure each area is fully saturated.