A hair roller or hair curler is a small tube that is rolled into a persons hair in order to curl it, or to straighten curly hair, making a new hairstyle.. The diameter of a roller varies from approximately 0.8 inches (20 mm) to 1.5 inches (38 mm). The hair is heated, and the rollers strain and break the hydrogen bonds [citation needed] of each hairs cortex, which causes the hair to curl.Hair straightening is a hair styling technique used since the 1890s 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 males and females of all races. It is accomplished using a hair iron or hot comb, chemical relaxers, Japanese hair straightening, Brazilian hair straightening ...
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