A dental appliance comprising: a tongue support element (1) with a trough (2) for the tongue, the trough having a concave inner surface and a convex outer surface； a tooth support element (3) with an upper and a lower bite surface (4a, 4b), which are arranged on the outer surface side of the tongue trough (2) so that the upper bite surface (4a) coincides with the lower bite surface (4b), only on an opposite side of the tongue trough (2), and so that a first end (5) of the inner surface of the tongue trough is between the upper and the lower bite surfaces (4a, 4b) of the tooth support element (3). The inner surface (6) of the tongue trough is directed sideways in relation to the tooth support element (3), the inner surface (6) of the tongue trough being arranged to receive a patient's tongue and to position it to a side of the oral cavity, partly between the bite surfaces (4a, 4b).
