By Jonathan AmosScience correspondent, BBC News
Scientists have found some of the earliest evidence for widespread tooth decay in humans.
It comes from the skeletal remains of Stone-Age hunter-gatherers who lived in what is now Morocco more than 13,700 years ago.
The researchers tell the PNAS journal that the individuals were eating a lot of high-carbohydrate nutty foods.
The poor condition of their teeth suggests they were often in agony.
“At a certain point, the tooth nerve dies but up..