On dry hair, apply and distribute evenly from root to tip.
Leave on for 10 minutes. Do not rinse.
Apply N°3 Hair Perfector™ and comb through.
Leave on for 10 minutes. Rinse well.
Shampoo and condition with N°4 and N°5.
Use as a two-part system with N°3 once a week or 2-3x per week for very damaged hair.