To repair damaged hair. Cut off the dead ends. When shopping, remember that you get what you pay for in hair care products. Use a shampoo and conditioner that says "Strengthening" or "Repair" to rebuild the bonds in your hair. Use a leave-in conditioner that protects your hair from the heat, and protects from sun and wind. To keep it healthy, do not blow dry your hair. It causes too much damage. When you use a heat iron, use a heat protectant. Don't wash your hair every day. If your hair is fine and wavy, use a low heat setting. If you have thicker, frizzier hair, then use a higher heat setting. Always use a hot iron with a heat setting.