Description No.4D Clean Volume Detox Dry Shampoo from Olaplex is a light-as-air dry shampoo in which skin-care science meets haircare innovation to make good hair days good for your scalp. No.4D leaves hair looking first-day fresh with clean, weightless body and scalp feeling comfortable. Ultra-fine micro starch from rice helps absorb oil for clean, soft hair. How do I use it: Use between wash days or on clean, dry hair to amplify first-day styles. Shake well before using. Separate hair into sections. Hold the bottle 6" to 10" away from hair and spray onto roots. Wait 30 seconds and massage into the scalp. Absorbs oil, volumizes, refreshes and detoxifies. All hair types and colors. New, unopened, and unexpired.