Our professionally inspired treatment prepares your hair for deeper repair, rebuilds hair connections, strengthens and protects hair integrity. Scientifically proven: 68% more repair and 3 times the strength. Prepares hair to intensify the benefits of No 3 Hair Perfector Strengthens weakened bonds deep within the hair strand Repairs hair from chemical, thermal, mechanical and environmental damage Use Apply No. 0 to DRY hair, saturating each section completely. Leave on for 10 minutes. DO NOT RINSE Apply No.3 Hair Perfector to hair with No.0 applied on top, combing through as needed. Leave on for at least 10 minutes Rinse and apply your shampoo and conditioner For best results, use Shampoo #4 and Conditioner #5.