Orthodontic appliances and aids, namely, appliances for the treatment or training of teeth, dental arches, tongue, intra-oral musculature and/or facial muscles; intra-oral appliances for use in training the tongue and intra-oral musculature, and intra-oral appliances for use in treating or supporting cranio-mandibular joints, namely, the temporomandibular joint; medical devices for treating breathing disorders and for assisting breathing; intra-oral medical devices for use in treating snoring...