Orthodontic appliances and aids, namely, appliances for the treatment and training of teeth, dental arches, tongue, intra-oral musculature and facial muscles; dental devices, namely, intra-oral appliances for training the tongue, lips and intra-oral musculature, in particular active intra-oral appliances for training the tongue, lips and intra-oral musculature; dental devices, namely, intra-oral appliances for treating and supporting cranio-mandibular joints, including the temporomandibular j...