Do straightening irons damage my hair?
Hair straighteners apply heat to your hair, and this weakens the protective hair cuticles. The severity and speed of the damage is very personal though and depends both on your hair and the way you use your flat iron. Don't overdo it, and protect your hair from heat as much as you can.you can try hair straighteners that use steam.
Should I use heat protectants?
Basically we already answered this with the previous question: Yes, it's better for your hair to use heat protection products. Use your preferred spray or oil, and give your hair a regular deep condition to keep it hydrated.