Tip 4: Avoid constant heat. Heating tools such as blow dryers and flat irons place major stress on the hair and increase the chance of hair breakage. For naturally curly hair, air drying is always best. However, if you must use a blow dryer, use a diffuser attachment that minimizes heat and maintains curl definition. If you intend to straighten your hair with a flat iron, use a ceramic flat iron that prevents breakage and greatly reduces damage.