Olaplex Hair Perfector No. 3 If you colour your hair and you've yet to try the Olaplex Hair Perfector No. 3 ($28), um, where have you been? The pro formula is a go-to for hairstylists at salons because it rebuilds the broken bonds caused by the chemical treatment process, but the at-home version is just as impressive as the OG — and just as much of a must-use. Image Source: sephora.com Olaplex Hair Perfector No. 3 $28 from sephora.com Buy Now