A. Global Keratin Hair Taming System with JUVEXIN is a Keratin based system with straightening capabilities that naturally washes out in 5 to 6 months. It protects and restores the hair without using harsh chemicals. Relaxers and Japanese straightening work on breaking and rearranging the internal bonds of the hair. Once these processes are done, the hair is permanently straightened. The new growth of the Japanese straightening will always be curly, but the previously straightened hair will never revert or blend back.