CLEAN HAIR. HEALTHY SCALP. Light-as-air dry cleansing technology for scalp and hair that feel just washed. This healthy scalp dry shampoo is clinically proven to not clog pores or leave a white residue. No more dry, powdery roots or gritty buildup. Nº.4D is proven to leave hair looking and feeling clean. KEY BENEFITS: Clean, weightless body; Detoxifies scalp; No grit or powdery residue; No clogged pores.