how to straighten hair without damaging it?

so i have 3B hair and i have been straightening (with heat protectant) my hair since i was about 8 and im 15 now and i have some damage in the front. but i model and I've noticed that most clients like straight hair.. so how do i keep my hair as healthy as possible and not damaged because i really love my hair and i don't want to loose my curl pattern 

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