"Ancient hunter-gathererers often had front teeth that met together, unlike today's more common alignment where the upper front teeth 'overbite' the lower front teeth," writes Slashdot reader omfglearntoplay . "This malocclusion is a result of changes to the ancestral human diet and introduction of soft foods , according to a new study published in the journal Science ." ABC News reports:The researchers also discovered that hunter-gatherer societies only have about 27 percent the number of labiodentals found in agricultural societies."Moreover, when they focused on the Indo-European language family -- which stretches from Iceland to the eastern Indian state of Assam and has records stretching back more than 2,500 years on how sounds in some of its languages were pronounced -- they found the use of labiodentals increased steadily following the development of agriculture," the report says. "All in all, they estimated that labiodentals only had a 3 percent chance of existing in the Indo-European proto-language that emerged about 6,000 to 8,000 years ago but are now found in 76 percent of the family's languages."