How can i keep my hair straight?

ok well, im a girl that straightens her hair all the time, and I love it, I love my hair, but like when I get too school, my hair start to curl, got an advice on what to do, and dont suggest a new straightner, bc I got a professional one, and no done...

suggest hairspray, either bc it makes my hair all nappy, and greasey like, so got an advice on what I can do thanks!

they make a straightin hair spray like when you spray heat protection on your hair its like that, it works great! So im not talking about hairspray but stuff that is made to go on your hair like heat protection but it straightens it.

I straightin mi hair 2 its curl bac just like you said urs does but I live with it