How did the teeth of Orrorin tugenensis differ from those of modern humans?

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Illustration showing side-by-side reconstructions of five hominins in the human lineage: Australopithecus afarensis, Homo habilis, Homo erectus, Homo neanderthalensis, and Homo sapiens, with each figure labeled and depicted in a walking pose to highlight evolutionary changes in posture and body structure. A scale bar at the top right indicates relative height. — human evolution An artist's depiction of five species of the human lineage.

While Orrorin tugenensis is considered a hominin due to features of its femur that suggest bipedalism, its dental anatomy remains primitive and distinct from that of modern humans.1

Specifically, Orrorin tugenensis possesses canine and premolar teeth that are described as distinctively apelike. In contrast, modern humans have canine teeth that are relatively small, nonprojecting, and incisorlike. Furthermore, while O. tugenensis shares the trait of thick molar enamel with later hominins, its overall dental morphology lacks the reduction in size and the specialized characteristics that define the modern human condition.12