Shorter jaws with smaller teeth The Australian Museum
To fit into the small jaw, the teeth were now smaller and arranged in a tightly parabolic arc. Faces were now vertical rather than projecting. Comparing then to now . Seven million years ago. Seven million years ago, our ancestors’ jaws and teeth were similar to those of modern chimpanzees. Dental arcade and tooth rows: teeth were arranged in the jaw in a rectangular or U-shape; a diastema