Straightener is an electrical device used for hair straightening. In recent years more and more popular and sophisticated. Used by hairdressers but also at home. Straightener has two plates which, when heated to a suitable temperature straight hair. We put a lock of hair between the two plates and drag from the base to the tip of the hair. The plates can be made of different materials, but the best are of the ceramic or titanium. Frequent use straighteners can damage hair so do not use it all the time. Straightener can be used to curl hair and are necessary for the treatment of keratin.