The apex of the Bonwill's Triangle is located at the:
Bonwill triangle - An equilateral triangle formed by lines from the contact points of the lower central incisors, or the medial line of the residual ridge of the mandible, to the condyle on either side and from one condyle to the other.
Anterior tip of the incisive papilla
Upper central incisor's contact point
Anterior most point on the chin
Lower central incisor's contact point