Organic Perms work the best. The ingredients are not too harsh for double-processed or heavily highlighted hair. One way you can find out if your hair is damaged and can't withstand more processing is to do the old float trick. Take a few strands of hair and put them in a glass of water, if they sink, this means your hair is damaged and is soaking up moisture. If the strands float, this means your hair is healthy. You may want to keep it that way and go with the organic perm.