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Hair crimping is a method of styling usually straight, long hair so that it becomes wavy, often in a sawtooth fashion. In the American South, it is usually referred to as crimping, but also can be called krinkles or deep waves.
Hair crimping is usually achieved by treating the hair with heat from a crimping iron (also referred to as hair crimper) or by braiding the hair, often in multiple strands, then undoing the braids. A crimping iron has parallel heated plates designed with a flat S-shaped repeating groove.
In 1972, the modern crimping iron was invented by Geri Cusenza, one of the co-founders of Sebastian Professional.
Crimping peaked in mainstream popularity during the mid-1980s. In 2007 at a Chanel runway show crimped hair was shown on a model, and it became more popular throughout late 2007 and 2008. Crimping's popularity has a tendency to return in ten-year cycles, although it is often seen in fashion and hairstyle shows due to its visually striking effect.
To read more about hair crimping, please click on the following link: http://en.wikipedia.org/wiki/Hair_crimping