It’s true, not everyone is blessed with all 4 wisdom teeth, and some people do not get any at all!  This does not mean they are any less wise, however.  One current theory to explain the lack of wisdom teeth in some adults, as well as why so many of us have trouble with ours, is evolution.  Scientists at the University of Pennsylvania discovered a chromosomal mutation called MYH16.  This mutation is explained as an evolutionary tactic which has allowed modern humans to grow larger brains, and also means humans have less need of, and room for, wisdom teeth.