Hair straightening is a hair styling technique involving the flattening and straightening of hair in order to give it a smooth, streamlined, and sleek appearance.

It became very popular during the 1950s among black men and among women of all races. It is accomplished using a hair iron or hot comb, chemical relaxers, Japanese hair straightening,

Brazilian hair straightening, or roller set/blowdryer styling. In addition, some shampoos, conditioners, and hair gels can help to make hair temporarily straight.