1. A measuring device for determining orthodontic dimensions for an individual's teeth as they relate to facial landmarks, the device comprising: a gauge for determining a measurement between landmarks of the individual's face when worn, the gauge having a transparent ruler body and comprising (a) a center marking line adapted to be centered over the individual's nasion; (b) a plurality of peripheral marking lines spaced at standard distances from the right and left of the center marking line; and (c) a central bridge for supporting the ruler body on the nose of the individual; frames attached to the transparent ruler body of the gauge; a left vertical strut slidably engaged within a left horizontal slot in the ruler body, which aligns with landmarks of the left eye of the individual; and a right vertical strut slidably engaged within a right horizontal slot in the ruler body, which aligns with landmarks of the right eye of the individual, wherein the left and right vertical struts slide within the left and right horizontal slots at least from the inner canthus to the outer canthus of the individual's left and right eyes, respectively.