Are there any methods to straightening hair in a healthy way?

I mean, without using chemicals or flat irons? My hair is naturally wavy and voluminous. And if there isn't any way to straighten it sans the iron/chemials, how can I straighten it with an iron and still prevent split ends? Thank you!Are there any methods to straightening hair in a healthy way?
Well hairspray.


But there is this spray that prevents your hair from getting damged by a iron.


You might want to try that out.Are there any methods to straightening hair in a healthy way?
What I did was get a haircut that made my hair straight. It worked really good too. Just go to a stylist and say I want my hair straight without using any chemicals. This doesn't work if you have poofy hair tho because you will have really straight poofy hair! :) You don't have to get a major one either just a simple trim can work!