Description | The Nº.3 Hair Perfector, infused with patented OLAPLEX Bond Building technology is a pre-shampoo treatment proven to repair and strengthen hair from within. Use No. 3 Hair Perfector alone or in combination with OLAPLEX No. 0 for ultimate at-home repair. | | The No. 3 Hair Perfector, infused with patented OLAPLEX Bond Building technology is a pre-shampoo treatment proven to repair and strengthen hair from within. Use No. 3 Hair Perfector alone or in combination with OLAPLEX No. 0 for maximum home repair.