"Gigantopithecus" had a dental formula of , with two incisors, one canine, two premolars, and three molars in each half of the jaw for both jaws. The canines, due to a lack of honing facets (which keep them sharp) and their overall stoutness, have been suggested to have functioned like premolars and molars (cheek teeth). Like other apes with enlarged molars, the incisors of "Gigantopithecus" are reduced. Wearing on the tongue-side of the incisors (the lingual face), which can extend as far down as the tooth root, suggests an underbite. Overall mandibular anatomy and tooth wearing suggests a side-to-side movement of the jaw while chewing (lateral excursion). The incisors and canines have extremely long tooth roots, at least double the length of the tooth crown (the visible part of the tooth). These teeth were closely packed together.