More lingual surfaces are shown in another case before (Fig.8) and after (Fig.9) orthodontic treatment.  Thin curved black lines represent the gingival margin of the central incisors, i.e., the upper border of the central incisors.

Adult Overbite

Xin Wei, DDS, PhD, MS 1st edition 03/27/2016, last revision 03/27/2016