Ancient Arctic bear had a sweet tooth, and needed a dentist

The prehistoric bear that Ottawa’s Natalia Rybczynski dug up in the Arctic looks quite a lot like black bears today, and it carries a mystery. Its teeth had cavities.
Some 3.5 million years ago the bear they call Protarctos abstrusus lived in a warm, wet habitat on Ellesmere Island in today’s Nunavut. 
The bear was previously known only from one fossil tooth found in Idaho. But in the Arcyic Rybczynski, a paleobiologist from the Canadian Museum of Nature, found most of a skull,