Protect your hair from heat. Heat denatures the keratins (proteins) of the hair shaft weakening it and making it prone to split ends. Heat treatments are a major cause of damage and split ends. This includes hot blow drying, heat styling, straightening and curling through heat, and steam treatments. If you do use these treatments, take these precautions:
Do not straighten or use other high-heat treatments more often than once every two weeks, or preferably once a month.
Look for irons or other tools that allow for exact temperature control. Keep them set to below 356ºF (180ºC).
Let hair stylists know that you prefer low-heat treatments.
Protect your hair before swimming in a pool, ocean, or lake. Consider applying a special pre-swimming moisturizer product. Alternatively, use a leave-in conditioner, oil your hair, and/or wear a swim cap. Rinsing your hair thoroughly before swimming may reduce its absorption of harmful chemicals. Be sure to rinse and shampoo your hair as soon as possible after swimming.