Snorkel or scuba diver's denture.
D003768:Dental Occlusion, Centric; D003779:Denture Design; D003824:Denture, Complete; D004242:Diving / Q000009:adverse effects; D006801:Humans; D007575:Jaw, Edentulous; D009064:Mouth Protectors; D014716:Vertical Dimension