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How are human teeth adapted to an omnivorous diet?

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A labeled cross section illustration of an adult human molar shows the tooth's crown and root, with layers including enamel, dentin, and pulp, as well as gum, cementum, blood vessels, periodontal ligament, lateral canals, and nerve. — tooth Cross section of an adult human molar.

Human teeth are adapted to an omnivorous diet by possessing structural and functional characteristics that fall between the extremes of specialized carnivores and herbivores.1

A key feature of this adaptation is the presence of bunodont molars, which are characterized by low, rounded cusps suitable for both crushing and grinding a variety of plant and animal tissues. Unlike the sharp, pointed teeth of carnivores designed for shearing, or the large, flat, ridged teeth of herbivores designed for breaking down cellulose, human teeth provide a versatile surface for mastication.21

Furthermore, while canine teeth in many mammals are large and interlocking—restricting movement to a simple up-and-down motion—human canines are small and do not project significantly beyond the other teeth. This unique reduction allows for a rotary chewing action, which is essential for processing a diverse diet. Consequently, human anatomy reflects a balanced evolutionary strategy that supports the consumption of both plant matter and animal protein.31