An appliance for treating human keratin materials, includes a treatment head and a handle for holding the appliance in one hand in order to apply the head to the human keratin materials, notably the skin, the appliance having a housing for holding a refill containing a product to be applied, the handle and the treatment head forming an elbow, the housing being oriented substantially in line with the treatment head and open in an opposite direction to the treatment head, the refill being arranged so as to be actuated by the user in order to dispense a metered quantity of product.
