Disclosed is a tooth whitening apparatus. The tooth whitening apparatus, according to the present invention, comprises: a mouth gag inserted into an oral cavity and brought close to teeth and a main body connected to the mouth gag through a cable to supply electrical power thereto and having a switch formed therein for controlling the on/off of the mouth gag, wherein the mouth gag includes: a body having a flat rectangular shape, wherein the body is curvedly bent and has a receiving space formed therein and an opening formed on one side thereof a light emitting unit installed in the receiving space of the body and having a PCB in which a plurality of light emitting diodes are implanted and an oral-cavity mounted part that includes a coupling member that is detachably coupled to the outer periphery of the opening of the body and has an air vent in the center thereof and an insertion member that is formed on one side of the coupling member and inserted into the mouth and makes contact with the teeth, wherein a holding member protrudes from the inner surface of the insertion member so as to be held between teeth, and a long air vent is formed through one portion of the insertion member such that the insertion member has air permeability.Linvention concerne un appareil de blanchiment des dents. Lappareil de blanchiment des dents selon la présente invention comprend : un ouvre-bouche inséré dans une cavité buccale et amené à proximité des dents et un corps principal relié à louvre-bouche par lintermédiaire dun câble afin de fournir de lénergie électrique à celui-ci et ayant un commutateur formé dans celui-ci pour commander la marche/larrêt de louvre-bouche, louvre-bouche comprenant : un corps ayant une forme rectangulaire plate, plié de façon incurvé et présentant un espace de réception formé en son intérieur et une ouverture formée sur lun de ses côtés une unité démission de lumière installée dans lespace de réception du corps et ayant une carte de circuit imprimé sur
