straightener is an electric hairdressing device composed of two heating plates between which the strands of hair are placed in order to be straightened. Depending on the model, the straightener can be equipped with ceramic, tourmaline or titanium plates . Each of these materials has its own characteristics, and thus gives the hair a very specific straightening technique and result. The ceramic plates allow, for example, a homogeneous, regular and uniform diffusion of the heat, and which thus offers an easy smoothing.