The application discloses a force couple orthodontic accessory, a personalized fixed appliance, a tooth
correction system, a design method of the force couple orthodontic accessory and a design method of the tooth
correction system. The force couple orthodontic accessory comprises a bottom plate, an accessory body and a force couple structure, the bottom plate is used for being bonded with a labial
buccal surface of a tooth, the accessory body is provided with an arch wire accommodating cavity, and the force couple structure is arranged in the arch wire accommodating cavity and comprises protrusions and / or grooves which are symmetrically arranged on both sides of the channel and are used for cooperating with partial bending structures of an arch wire to form a force couple for a
single tooth. The personalized fixed appliance comprises a plurality of force couple orthodontic accessories and a personalized arch wire, the arch wire is provided with partial bending structures corresponding to positions of teeth to be corrected, and a preset force couple is formed after loading. The force couple orthodontic accessory, the personalized fixed appliance and the tooth
correction system provided by the application realize accurate force couple control of a
single tooth and improve correction precision and a personalized degree.