Hair Perfector N°3, OLAPLEX's bestseller, has been exclusively developed to proactively repair new damage caused by everyday life. Containing the same active ingredients as N°1 and N°2, N°3 Hair Perfector offers the opportunity to keep hair vital and strong between visits to the salon, preparing it for the next chemical treatment. With a PH between 3.5 and 5, it helps to bond and protect damaged bridges in the hair, while restoring the hair's natural balance. It is recommended to try 3-6 applications of bottle N°0 depending on hair length and density for optimal results.