The diastema is labelled as part 3. A diastema is a gap or space between two teeth, often seen in mammals with elongated canines such as dogs or in some primates. In the case of the labelled image, the diastema is the gap between the canine tooth (part 2) and the first premolar tooth (part 4). This gap in the teeth allows for a larger range of motion of the jaw and can help in grasping and tearing food.
