a continuous wall that engages facial and lingual surfaces of the patient's teeth and provides a desired visual impression including a selected color and a selected contour, the wall comprising:

an inner surface adapted to engage with the facial and lingual surfaces of the patient's teeth; and

an outer surface comprising a tongue side arch and a visible cheek side arch, each of the arches extending from a first posterior location to an anterior portion and then to a second posterior location; and

a plurality of retentive points for securing the dental appliance to the patient's teeth, the retentive points being supra gingivital;

wherein thickness of the wall between the inner and outer surfaces on the cheek side arch progressively increases toward the first and second posterior locations relative to the anterior location, thereby achieving the desired visual impression.