Hair crimping is a method of styling usually straight, long hair so that it becomes wavy, often in a sawtooth fashion. This is usually achieved by treating the hair with heat from a crimping iron or by braiding the hair then undoing the braids.
In 1972, the modern crimping iron was invented by Gugi Cannon-Hill.
Crimping peaked in popularity during the mid 1980s.
In Southern American states, it is usually referred to as krinkles or deep waves.