An orthodontic appliance (1) that is particularly useful for correcting a classocclusion is disclosed. The appliance (1) includes a mounting arrangement (3)for mounting over an upper arch of a user having a front region and two arm regionsextending rearward from the front region. The mounting arrangement (3) includesan outer wall (7) and an inner wall (9) and a web (11) extending there between. Theouter wall (7), the web (11), and the inner wall (9) collectively define an upperchannel (21) within which the upper arch and teeth of a user are received to mountthe appliance (1). They also define a lower channel (23) for receiving the lowerarch and teeth. The outer wall (7) has an upper portion (17) spaced forward of theupper arch teeth and gums forming an outer spacing formation (4) for holding thebuccal mucosa away therefrom. The appliance (1) also includes a tongue elevator(51) on a lower portion of the inner wall (19) for raising the position of a user'stongue. The appliance is made of a resiliently flexible material that when deformedout of a resting position corresponding to an arch form will tend to return to thedesired arch form. Further the resilient flexibility assists fitting of theappliance.
