1. Apply on dry hair, fully saturating each section.
2. Let it process for 10 minutes. Do not rinse.
3. Next, apply No.3 from root to tip (with No.0 already applied).
4. Comb through with a wide-toothed comb.
5. Again, leave the product to process for a minimum of 10 minutes.
6. Finally... rinse, shampoo and condition (ideally with Olaplex No.4 and No.5)