Oral dilator

An oral dilator, comprising:

• a first body comprising a housing and a first duckbilled element, wherein the housing comprises a peripheral wall and an upper cover, the periphery wall is connected to the upper cover and forms an accommodation space therebetween, the peripheral wall is provided with an inserting groove which communicates with the accommodation space, the upper cover is provided with a first opening, and the first duckbilled element is extended from the housing;
• a second body comprising a connecting portion and a second duckbilled element, wherein the connecting portion is inserted into the inserting groove, the connecting portion is provided with a second opening, and the second duckbilled element is extended from the connecting portion and corresponding to the first duckbilled element;
• a rotary member comprising a central shaft, a rotary switch and a rotary portion, wherein the central shaft passes through the first opening and the second opening, the central shaft is connected to the rotary portion, the rotary portion is between the rotary switch and an upper surface of the upper cover, the rotary portion is provided with a first teeth portion, and the rotary member is capable of being rotated to drive the second body to rotate;
• a positioning member comprising a second teeth portion disposed on a surface of the upper cover of the first body, and the rotary member is locked when the second teeth portion engages with the first teeth portion,
• wherein the upper cover is above the second body, the rotary member, and the positioning member.