Abstract: A mouthpiece of the present invention includes a light irradiation section for irradiating the front surfaces of teeth with light having a predetermined wavelength, and the light irradiation section has a blue light emitting diode or an ultraviolet light emitting diode. The mouthpiece is to be attached to the teeth, and the front teeth are irradiated with a blue light or ultraviolet light emitted by the light emitting diode, thereby performing teeth whitening processing.

Abstract: A mouthpiece of the present invention includes a light irradiation section that irradiates the front surfaces of teeth with light having a predetermined wavelength, and the light irradiation section has a blue light emitting diode or ultraviolet light emitting diode. The mouthpiece is attached to the teeth and the front teeth are irradiated with a blue light or ultraviolet light emitted by the light emitting diode, thereby performing teeth whitening processing.

Abstract: A beauty device (1) includes a light irradiation section (5) that irradiates light of a predetermined wavelength; and an ion generating section (7) that generates an ion. The light irradiation section (5) is placed at one side surface of a main body and the ion generating section (7) is placed at the other side surface of the main body. The light irradiation section (5) includes a plurality of light source modules (25A, 25B) arranged in a predetermined array. Each light source module includes a plurality of light emitting diodes (20a, 20b, 20c, 20d) that are arranged in a predetermined array to emit light of two or more wavelengths.