Light-as-air dry cleaning technology for scalp and hair that looks like it's been freshly washed. This healthy scalp dry shampoo is clinically proven to not clog pores or leave white residue. No more dry-dusty roots or rough build-up. nº . 4D is proven to leave hair with a clean look and feel. KEY BENEFITS - Clean-weightless body - Purifies the scalp from toxins - No sand or powder residue - No clogged pores is the top priority