Mouthpiece for whitening teeth

A mouthpiece for whitening teeth, comprising:

• a main body, which is formed in an arc shape having an outer surface and an inner surface, comprises a ventilation passage formed to penetrate the outer and inner surfaces, and is formed in a flexible structure so that its orientation and shape can be flexibly adjusted according to the user's oral structure;
• a bite, which extends a predetermined length inward from the inner surface of the main body in an arc shape, providing a biting surface during use;
• a tongue rest, which extends inward from the inner surface of the bite;
• and
• a handle, which extends outward from the outer surface of the main body;
• wherein the bite includes:
• a ventilation assist, which protrudes a predetermined length vertically from the inner surface of the bite;
• and a first ventilation opening, which is formed in a predetermined size on one surface of the ventilation assist and is connected to the ventilation passage.