Sue the T. rex had a terribly painful infection when she died

Sue, the mighty Tyrannosaurus rex whose skeleton is one of the most complete ever found, likely suffered from a big toothache due to three tiny, weird-looking teeth. 

“Two of these teeth are actually fused together,” said study lead researcher Kirstin Brink, an assistant professor in the Department of Geological Sciences at the University of Manitoba in Winnipeg, Canada. “One of the teeth has some extra serrations on the side of the tooth, not in the normal place on the front or back edges of the tooth.”

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