Why are teeth especially useful for identifying fossil mammals?

Teeth are exceptionally useful for identifying fossil mammals primarily because they are among the most durable parts of an organism's skeleton. Unlike soft tissues, which decompose rapidly, hard parts like bones and teeth are highly resistant to the ravages of time and are more likely to survive the fossilization process.1

Beyond their preservation potential, teeth are critical for taxonomy and evolutionary study because they reflect specialized dietary habits and structural relationships. Dentition—including the overall tooth pattern and the specific shape of individual teeth—is essential for determining the relationships between fossil forms. Because mammalian teeth evolved into diverse forms such as incisors, canines, and cheek teeth to accommodate specific food sources, their morphology provides a reliable record of an animal's ecological niche and evolutionary history. Consequently, paleontologists rely heavily on these dental characteristics to classify extinct species and understand the lineage of mammalian orders.234