My hair is very straight. I've had two perms in my life, first was great. Used the smaller rollers but didn't leave the solution on for as long as it was supposed to be. My second one was last year and didn't last long at all. She alternated between the medium and small rollers and it just fell out so quickly. There's some wave left if I wash it and let it air dry, but by next brushing, its almost straight. So make sure you go to a salon that knows what they are doing, even if it means paying a bit more.