Deep Nourishing Treatment is the fourth step in our SUKU Treatment system. It is a deeply nourishing treatment that's infused into the hair cuticle, sealing it flat to provide strength and restore sheen. BEST USED AS A DEEPLY NOURISHING CONDITIONING TREATMENT ON DRY, DEHYDRATED, POROUS TEXTURES Work in each quadrant separately for this process. Apply Deep Nourishing Treatment evenly through the mid lengths and ends of towel-dried hair. Detangle quadrant, ensuring to retwist detangled section to avoid new tangles from forming. To activate deep penetration, leave in for up to 20 minutes under a steamer. Repeat until full head of hair is done. Rinse thoroughly, lightly combing out or brushing hair as you rinse.