The Nº.3 Hair Perfector, infused with patented OLAPLEX Bond Building technology, is a pre-shampoo treatment that is proven to repair and strengthen hair from the inside out. Use the Nº.3 Hair Perfector alone or paired with OLAPLEX Nº.0 for maximum at-home repair. Nº.3 Hair Perfector reduces breakage and visibly strengthens hair Nº.3 Hair Perfector repairs and protects deep within the hair strands Nº.3 Hair Perfector restores healthy appearance and texture Apply to damp hair from root to ends. Leave on 10 minutes for maximum efficacy. Rinse thoroughly. For best results, cleanse with OLAPLEX Nº.4 BOND MAINTENANCE SHAMPOO and OLAPLEX Nº.5 BOND MAINTENANCE CONDITIONER.