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Based on the emergence of its baby incisor teeth, researchers estimate the cub was about 3 weeks old when it died.

To learn more about the composition of rodent tooth enamel, Vesna Srot and colleagues captured high-resolution images of incisor specimens from several species.

Their large mouths, which can open up to 180 degrees, reveal large canines and incisors used primarily for defense.

When the singer and songwriter Adrianne Lenker was 21, she was involved in a bike accident that knocked out one of her incisors.

Additionally, burnt plant remains from the sites and distinct dental-wear patterns on the individuals' upper incisors indicate that tubers -- or plants that grow underground, such as potatoes -- likely were the most prominent subsistence resource.