Myofunctional appliances in orthodontics are the appliances which take help from the Muscles to act on the desired treatment plan, as the name suggests the muscles are used to bring out desired function. Tooth Borne Passive Appliances: Activator, Bionator, Herbst Appliance Tooth Borne active appliances: Expansion Screws, Springs etc Tissue Borne Passive appliance: Frankel regulator [&hellip