Removable appliances may be used to move selected teeth, to hold selected teeth in place, to influence growth of the jaws, and to influence tooth eruption. They are often used in conjunction with fixed appliances.
Removable appliances cannot be used to treat all orthodontic problems. It takes skill and experience to recognize conditions that can be successfully treated with removable appliances.
Because the patient can easily remove the appliance, good compliance is required to achieve the desired outcome.