You should allow 4-6 weeks between any chemical hair treatment - perms, straightening, color. I haven't had my hair permed in years, been using it's natural curl for a few years. I like the control of a perm and my hair will hold it for a year if I don't cut if off. Whenever I mention to my stylist that I 'need" a perm" she gets that look, like NO, you don't want to do that. I used to have a perm always during the 80's/early 90's but then straight or natural styles became popular.