Children’s growth and development are easily influenced by the external environment and the body itself. For example, children who breathe with their mouths open are prone to buck teeth, and children with bad finger-sucking habits are prone to open bites and protruding mouths. Functional orthopedic treatment is a simple orthodontic appliance that affects the facial bones of children during the growth period, removing the factors that affect the normal growth and development of the facial bones to achieve the purpose of bone reshaping. Functional orthodontic treatment also applies force to the alveolar area to improve the alveolar morphology, thereby improving the eruption position of the teeth. The uniqueness of functional orthodontic treatments lies in the mode of their effect, which differs from traditional mechanical appliances in that they transmit muscle-generated forces and guide the skeletal growth process and tooth eruption by harnessing, activating and inhibiting these natural forces. This mode of effect exploits the growth potential of the bone, the eruption potential of the teeth and the action of the muscles, and is a new holistic treatment for the correction of teeth while changing the morphology of the alveoli and jaws.