Oral device (10, 20, 30, 40, 40 ', 50, 60), comprising: a first interocclusal surface (3s) insertable between the arches of left teeth, a second interoclusal surface (3d) insertable between the arches of teeth rights, said first and second interoclusal surfaces (3s, 3d) disposed substantially in a horizontal (O) plane and specular with respect to a sagittal plane (s) perpendicular to said horizontal plane (O) and passing between the two interocclusal surfaces ( 3s, 3d), the oral device (10, 20, 30, 40, 40 ', 50, 60) extends along an extension direction (d) formed by the intersection between said horizontal plane (or) and said Sagittal plane (s) and goes from the back side (11), which can be positioned in use between molar teeth of the tooth arches, to the front side (12), which in use is oriented to the canine teeth and the incisors, wherein: said first interocclusal surface (3s) and said second interocluted surface salt (3d) is unified by at least one upper arch (2), which in use extends above said horizontal plane (O) towards the palate, and at least one lower arch (1), which in use extends by under said horizontal plane (O) towards the base of the mouth； said at least one lower arch (1) and said at least one upper arch (2) form an opening (A) sized in a manner that receives at least partially use of the tongue； characterized in that said at least one lower arc (1) is in a plane (I) that forms with said horizontal plane (O) in said direction of extension (d) an acute angle γ, such that the lower arc ( 1) extends towards said front side (12)； said at least one lower arc (1) has a lower arc section (1s) in the sagittal plane (S) inclined in a way that forms an acute angle α with said extension direction (d)； said at least one upper arc (2) has an upper arc section (2s), in the sagittal plane (S), inclined in a way that forms an acute angle β with said extension direction (d)； and so that, as a consequence, the tongue in use enters said opening (A) is pushed towards
