Inclusion Criteria:  Subjects with sufficient dentition present for the determination of the upper occlusal plane Subjects with more than 12 occluding pairs and stable intercuspal position Subjects with teeth restorations that did not grossly alter its morphology Subjects who did not undergo orthodontic treatment and/or did not have teeth that rotated more than 45 degrees and/or displaced more than 1.5 mm Subjects who are of Cantonese descent.  Exclusion Criteria:  Subjects with periodontal disease whereby there is pathological tooth migration and alteration of occlusal plane. Subjects who are under the age of 18 and unable to give consent. Subjects with extensive teeth restorations that affect the morphology.