The present invention relates to an oral device for myofunctional re-education adapted to be worn between a patient's lips, characterised in that the device comprises:- a support surface for the upper lip (5),- a support surface for the lower lip (10),- an obstruction portion for obstructing the zone between the upper surface and the lower surface (16),- a wall (20) projecting from the upper support surface (5) in a position adapted to be interposed between the upper lip and the upper dental arch when the support surfaces are clamped between the lips；- a wall (22) projecting from the lower support surface (10) in a position adapted to be interposed between the upper lip and the upper dental arch when the support surfaces are clamped between the lips.
