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http://www.latimes.com/science/sciencenow/la-sci-sn-raw-meat-stone-tools-evolution-20160309-story.html
...modern human teeth are not suited to breaking chunks of raw meat into pieces that are small enough to swallow.

Effective raw-meat eaters like wolves and lions have teeth that are designed for slicing through elastic muscle, almost like a pair of scissors. Humans, on the other hand, have teeth that act like a mortar and pestle. Our pearly whites are designed for crushing, not slicing....

..."We didn't just start eating meat," Lieberman said. "We had to invent some technology in order to be able to do it."

Zink and Lieberman further reason that once the mechanical work of breaking down food could be started outside the oral cavity, it would have left our ancestors free to use their mouths for other things besides chewing — like talking....