Abstract: A method and a device are described for producing the whitening of live teeth with pathological and normal colorations, destined to whitening any tooth with normal color and furthermore eliminating the pathological coloration produced by aetiologies of different origin. The whitening of the teeth (6) is effected applying different chemical products to the dental enamel, covering the teeth to be treated with a metallic plate containing an absorbent material with a chemical whitening product which acts in the presence of heat and provokes the reaction of said product which will act on all sides of the dental drown, producing whitening of the teeth. The device is constituted, in essence, by a whitening device, comprised by a thermic heating unit, whether or not controlled by microprocessor, heating elements, temperature, time and alarm sensors and controls.