A medical force application device for use in oral cavity and dental instrument for applying forward force to lower jaw

The utility model provides a medical force application device used in the oral cavity and a dental instrument used for applying forward force to the lower jaw. The orthodontic force application deviceis elastic and telescopic, correction force is provided for orthodontics by utilizing rebound force generated by compression or stretching, the orthodontic force application device comprises a firstelement and a second element which can relatively move along a first axis, and a mark is arranged on at least one of the first element and the second element and used for indicating the magnitude of the rebound force.