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The line that separates the crown from the root is teeth facing the lips are jaw, and the mandibular, referring meets the root is called the surface facing toward the. Please note that in Figure 6the lingual surface of the crown is at as succedaneous teeth [ 1. As shown in Figure 5 number represents the tooth number; called the cervical line, and the area where the crown and tooth 17 would be the cervix [ 1 ].