How do tooth shapes reveal the diets of extinct mammals?

The study of dental morphology provides critical insights into the diets of extinct mammals. By analyzing tooth shape and structure, researchers can infer how these animals processed their food.1

• Primitive Dentition: Early mammalian teeth typically featured high, sharp cusps designed for tearing flesh or crushing the chitinous exoskeletons of arthropods.1
• Herbivorous Adaptations: To manage the wear caused by fibrous plant material, specialized herbivores developed complex patterns of tooth contact (occlusion). Common adaptations include the expansion and flattening of premolars (molarization) to create grinding surfaces, the development of a gap between teeth known as a diastema, and the evolution of rootless teeth that grow continually throughout life.1
• Omnivorous Traits: Mammals with varied diets often possess bunodont molars, which are characterized by low, rounded cusps.1
• Specialized Reduction: In cases of extreme dietary specialization, such as myrmecophagy (ant-eating), mammals often exhibit a marked reduction or total loss of teeth, as seen in the anteater and pangolin.1

These evolutionary trends demonstrate how dental form consistently aligns with the functional requirements of an animal's specific diet.1