Other options include the Brazilian or Japanese straightening, which can be used on a variety of hair textures. In the Japanese method, a chemical is applied to the hair to break down the protein bonds in the hair. The chemical is then rinsed out, the hair is dried and styled straight, and then a neutralizing solution is applied. In the Brazilian method, a keratin solution is used, instead of a chemical one. The keratin solution is sealed into the hair with a flat iron. Because no chemicals are used, this solution is only semi-permanent.