the upper support frame is a serpentine upward-bent rod formed by sequentially winding a thin steel wire up and down, and a left end and a right end of the serpentine upward-bent rod are positioned at a lowest position of the serpentine upward-bent rod; the lower support frame is a serpentine downward-bent rod formed by sequentially winding another thin steel wire up and down, and a left end and a right end of the serpentine downward-bent rod are positioned at a highest position of the serpentine downward-bent rod;

the support wing of the left molar area comprises a left C-shaped support rod and a left blocking support frame, the support wing of the right molar area comprises a right C-shaped support rod and a right blocking support frame; an upper end of the left C-shaped support rod is connected to the left end of the serpentine upward-bent rod through a first connecting rod, a lower end of the left C-shaped support rod is connected to the left end of the serpentine downward-bent rod through a second connecting rod, an upper end of the right C-shaped support rod is connected to the right end of the serpentine upward-bent rod through a third connecting rod, and a lower end of the right C-shaped support rod is connected to the right end of the serpentine downward-bent rod through a fourth connecting rod; the left C-shaped support rod, the first connecting rod, the second connecting rod, the serpentine upward-bent rod, the serpentine downward-bent rod, the third connecting rod, the fourth connecting rod, and the right C-shaped support rod are combined together to form an arc shape that is in contact with a periphery of teeth in an oral cavity;

the left blocking support frame comprises a first left strut, a second left strut, and a left arched rod; one end of the first left strut is arranged on an inner side of the left C-shaped support rod and is close to an upper part of the left C-shaped support rod, and one end of the second left strut is arranged on the inner side of the left C-shaped support rod and is close to a lower part of the left C-shaped support rod; an other end of the first left strut extends toward the left end of the serpentine upward-bent rod, and an other end of the second left strut extends toward the left end of the serpentine upward-bent rod; two ends of the left arched rod are respectively connected to the other end of the first left strut and the other end of the second left strut, and a middle part of the left arched rod arches outwards; the right blocking support frame comprises a first right strut, a second right strut, and a right arched rod; one end of the first right strut is arranged on an inner side of the right C-shaped support rod and is close to an upper part of the right C-shaped support rod, and one end of the second right strut is arranged on the inner side of the right C-shaped support rod and is close to a lower part of the right C-shaped support rod; an other end of the first right strut extends toward the right end of the serpentine upward-bent rod, and an other end of the second right strut extends toward the right end of the serpentine upward-bent rod; two ends of the right arched rod are respectively connected to the other end of the first right strut and the other end of the second right strut, and a middle part of the right arched rod arches outwards.