How to use Use OLAPLEX Intense Bond Building Hair Treatment Nº0 155ml as the first step of a two-part treatment that finishes with the application of OLAPLEX Hair Perfector Nº3 . Start by combing your hair and separating it into sections. Then, apply the formula generously onto dry hair, from the roots to the tips, until you end up with damp strands. Let it act for about 10 minutes. Without rinsing, apply the OLAPLEX Hair Perfector Nº3 , following its usage instructions. Each bottle of this product provides three to six applications, depending on the length of your hair. Repeat the complete treatment once or twice a week. Increase its frequency to three times if you’re struggling with very damaged hair