A biomechanical model of producing an “f” sound with an overbite (left) compared with an edge-to-edge bite (right). Some linguists are arguing that the advent of softer food, thousands of years ago, led to changes in biting patterns and eventually, to more frequent use of sounds like “f” and “v” in human language.

A biomechanical model of producing an “f” sound with an overbite (left) compared with an edge-to-edge bite (right). Some linguists are arguing that the advent of softer food, thousands of years ago, led to changes in biting patterns and eventually, to more frequent use of sounds like “f” and “v” in human language