It is important to deep condition your hair once in awhile to keep it healthy, beautiful, and to help prevent future damage. If your hair is dry or over-processed, deep conditioning can replenish the hair strength and moisturize. To deep condition hair, apply a protein enriched conditioner from the roots to the ends. Next, cover your hair with a plastic cap or plastic wrap and sit under a hood dryer for at least 20 to 30 minutes and then rinse your hair. Heat is needed to help the conditioner penetrate the cuticle layers more efficiently. For optimum health, deep condition your hair one to two times a month.