Process of non-therapeutic cosmetic treatment of human scalp, comprises applying cosmetic product and/or gas to the scalp using a spraying device operating with a compressed gas. An independent claim is included for system (1) for treating human scalp, comprising: a product for treating hair, comprising antidandruff-, antifall-, antiseborrheic-, antiinflammatory-, antirritation-/soothing- or stain resistant-product； and airbrush (2) having a reservoir (11) containing the product.
