Ans: Relaxers are like a permanent hair straightener as they change the hair texture of the cuticles over the time. When it comes to keratin treatment, it washes away after some time and natural curl returns after 6 weeks to a few months. If you are looking for beautiful straight hair at an affordable price, then relaxer is the obvious choice. It is better to pick a no-lye relaxer as it doesn’t contain calcium hydroxide.