In a recent letter from a client, Carla says:Hello, I have mid-back length hair that is thick. Every time I curl my hair (usually with rollers since a iron doesn�t work well with my hair), the curls look good but sadly only last less than half a day. They sorta stretch themselves out and unwind. Is there any solution for this and for hard-to-style hair?My response:Dear Carla. It's true, longer