Cheek retractor

A cheek retractor comprising:

• a cheek hook having a right cheek hook part and a left cheek hook part for widening a mouth of a user horizontally;
• and
• an arm having a substantially U shape and connecting the right cheek hook part to the left cheek hook part of the of cheek hook, wherein
• each of the right cheek hook part and the left cheek hook part of the cheek hook includes a crescent shaped outer flange configured to be located outside the mouth when the cheek retractor is mounted on the mouth of the user and a crescent shaped inner flange configured to be located inside the mouth of the user, and a crescent member is configured to be located between the outer flange and the inner flange,
• each of the inner flange and the outer flange includes a plurality of
• through holes connecting to respective protruding pins on each of left and right plate portions, each of the plate portions having a quadrangular shape and a predetermined size,
• an identifier portion including an identifier information of the user, the identifier portion having a predetermined size and printed or pasted on each of the plate portions disposed on the outer flange,
• through holes of the plurality of through-holes are formed at a predetermined interval on vertical lines intersecting a horizontal line at a substantially right angle, the horizontal line passing through centers of the outer flange of the right cheek hook part and the outer flange of the left cheek hook part, and
• each of the plate portions includes a plurality of the protruding pins for a connection to the respective through-holes on a side facing the mouth of the user when the cheek retractor is mounted in the mouth, and connected to the respective outer flanges.