The rapid palatal expander (RPE) is a fixed appliance which widens the patient’s upper jaw (maxilla). This appliance is used in growing patients to help correct both crowding and cross bites. An upper jaw that is too narrow is one component of your particular orthodontic problem list.
Because you are still growing, the doctor will use an expander to guide your natural growth and widen your upper jaw. This will help create room for your crowded teeth and make sure the upper and lower teeth fit together properly.