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. It will restore your hair’s healthy appearance and texture by repairing damage and protecting hair structure. It will improve your hair’s overall look and feel. PH Balance: 3.5-5