No. 4D Clean Volume Detox Dry Shampoo is a light-as-air dry shampoo clinically proven not to clog follicles or leave a white residue. No. 4D extends and amplifies the hairstyles you create for clients and gives their hair clean, weightless body while leaving the scalp feeling calm and comfortable. Use as a finishing touch in the salon and recommend as a take-home product to help clients achieve more good hair days that are good for their scalp.