ABSTRACT
Look carefully at the incisal edges, check for chipped or excessively worn incisal edges. Marked incisal mamelons may also be aesthetically unacceptable. The incisal edges of the four maxillary incisor teeth should be in the same horizontal plane or the lateral incisors slightly palatal to the central incisors, the maxillary lateral incisal edges should be 0.5 mm (0.2 inch) shorter than the central incisors. This arrangement contributes to a more youthful smile, but placing the four maxillary incisors at the same vertical level ages the smile. When the patient smiles the incisal edges of the maxillary anterior teeth should curve and follow the smile line of the lower lip.
