This Light-as-air Nº.4D clean volume detox dry shampoo comes with a dry cleansing technology for scalp which makes the hair feel as if it has been 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 with Nº.4D is proven to leave hair look and feel clean.