Intraoral photographs with indicated measurements. The four photographs used to obtain measurements of intraoral structures are shown, with indicated measurements. The tongue within the mouth photograph (P1) shows the mouth width, height, and area and tongue width. The tongue-extended photograph (P2) shows the tongue width, length, and area as well as mouth width. The profile tongue-extended photograph (P3) shows tongue length, curvature (in blue), thickness, and area. The tongue-depressed photograph (P4) shows the uvula width, length, and area at the soft palate and airway width.