This invention relates to a device for whitening teeth, including both a tank (16) for at least part of the whitening product in solid or semi-solid form, and a tank (17) of a product in liquid form and means designed to mix the products in powder form and in liquid form before they come out of a nozzle (14), the device also includes a duct (18) leading to the nozzle (14) and operatively connected to a pressurized energy source (219) from which, on command, a flow of gas extends； operatively connected in an intermediate position of a first stretch (18A) of the duct (18) there being the tank (16) of at least part of the whitening product； operatively connected in an intermediate position of a second stretch (18B) of the duct (18) there being the tank (17) of product in liquid form.
