Mouth gag for orthodontics

The invention discloses a mouth gag for orthodontic treatment, and belongs to the field of orthodontic treatment, the mouth gag comprises an arc-shaped plate and a cambered surface block, the bottom surface of the arc-shaped plate is an arc-shaped surface, the arc-shaped plate is placed in the oral cavity, and the bottom surface of the arc-shaped plate covers the upper side of the tongue; the top surface of the arc-shaped block is an arc-shaped surface, the arc-shaped block is placed in the oral cavity, and the top surface of the arc-shaped plate is attached to the bottom surface of the upper jaw of the oral cavity; a lifting supporting mechanism is arranged between the arc-shaped plate and the cambered surface block, and the lower portion of the lifting supporting mechanism is hinged to the arc-shaped plate. According to the mouth gag, the upper jaw, the tongue and the lower gum of the oral cavity of a patient serve as stress supporting points, teeth can be prevented from being shielded, a doctor can conveni