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. CONSUMER STUDY RESULTS: 100% saw no white residue, 97% said their hair looked clean, 97% saw a reduction of oil Benzene test results: NOT DETECTED (<0.1 ppm)