Olaplex No. 3 - a professional, weekly hair treatment that repairs broken hair bonds. Restore your hair to its glory days with Olaplex Hair Perfector No.3 At Home Treatment, a key step in this cult-favourite bond-rebuilding treatment. Olaplex No 3 works both with and without the first two steps of the Olaplex process to restore the bonds broken by heavy heat-styling, colour-processing, and bleaching. Stronger, happier healthy hair is in the post, thanks to Olaplex 3.