Ever wondered how celebrities like Emma Stone pull off dramatic hair colour changes without it all falling out? According to Stone’s colourist Tracey Cunningham, it’s Olaplex. Designed to be used before, during and after colouring, the in-salon and at-home range works by minimising the breakage and repairing the damage associated with chemical processing – namely the destruction of the keratin protein bonds within the hair’s cortex that keep strands strong. The professional components comprise a formula that can be applied to the hair pre-colour or added to the dye, and a post-colouring conditioning treatment. At home there’s a weekly treatment and the just-launched shampoo and conditioner, which help restore internal strength and moisture for shinier hair and vibrant, longer-lasting colour. And because thermal and mechanical friction can also break hair bonds, it’s ideal for hot-tool addicts too.