A palatal expander is a device in the field of orthodontics which is used to widen the upper jaw. This appliance can only be used while the child is growing.
The Nance Appliance is used to prevent upper molars from rotating or moving forward after extraction of primary teeth or during your orthodontic treatment.
The “Blue Grass” Appliance is designed to correct thumb sucking habits. A teflon roller that spins on a support wire acts as a substitute habit. The palatal lingual wire holding the roller is soldered to bands on the first molars.
The Herbst appliance, in conjunction with braces, is used to help the lower jaw develop in a forward direction.
The Forsus appliance is used in order to help move the upper molars back while moving the lower arch forward.