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1. An apparatus for training oral muscle tone of an awake user, the apparatus comprising a mouthpiece having a first electrode set associated with the mouthpiece and an external electrode set for location exterior of the mouth of the awake user, electrical circuitry operatively connected to the first electrode set and the external electrode set, wherein a controller configured to selectively energize one or both of the first electrode set and the external electrode set according to a treatment regime selected by the awake user, wherein the controller is operably connected the first electrode set and the external electrode set, wherein the apparatus is configured to provide, in use, via the first electrode set and/or the external electrode set, electrical stimulation to one or more oral muscles to increase resting muscle tone and/or muscle tone during sleep, the external electrode set comprising a first and second electrode being located or locatable lateral of a midline of a face of the awake user and wherein the controller is configured to apply electrical current laterally between electrodes of the first electrode set on a first side of a midline of the user's face in a first mode and to apply electrical current vertically between an electrode of the first electrode set and an electrode of the external electrode set that is on the same side of the midline of the user's face as the electrode of the first electrode set in a second mode.
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