If the source of the techniques of hair often goes back to the dawn of time, it was not until the end of the century to see the development of thermal techniques,. Later, Thermal brushes and straightening irons were used to straighten naturally wavy hair. These techniques were effective, but much damaged hair.Fortunately, science continues to advance. Today, special thermal units, designed to change the hair structure without damaging it, as well as products protect the hair during this process. Not only is there to smooth plates of different sizes, but there are also those can leave your hair silky smooth and completely in a few minutes. With new tools ranging in price from about 25 to about 120 euros, or more, you can make loops or smoothing that want.But some important rules you should know before using these devices to make the best possible benefits and minimize possible damage. Here are some simple rules for thermal hairstyles: One: any thermal process starts with the hair clean...