Apply Olaplex No.0 to your DRY hair, fully saturating each section. Let it stay on for 10 minutes. DO NOT RINSE OFF. Apply Olaplex No.3 Hair Perfector over your hair with No.0 applied to it, combing through as needed. Let stay on for a minimum of 10 minutes. Rinse, shampoo & then condition your hair. For best results, use Olaplex No.4 Shampoo & No.5 Conditioner.