Overuse of toothpicks by humans in ancient times may have caused teeth infections which could be the reason for the variations in jaw structures of oldest-known extinct human relatives found outside Africa, a new study reveals.
The researchers believe that tool use could have helped to alter considerably how the ancient members of the human family tree ate and survived, Discovery News reported.
The ancient hominid jaws have also suggested it as over experienced toothpicking, possibly leading to swelling and infection.
Scientists, who analyzed how jawbones from modern hunter-gatherers from Australia and Greenland could vary, compared them with Dmanisi teeth and jaws.
Margvelashvili said that Dmanisi hominids show the first clear case of overusing the toothpick, which led to infection.