How do you keep your hair straight. I straighten it but then during the day it starts flicking. any ideas?

flexible Hair spray or straightening serum,
I used to use paul mitchell super skinny straightening serum, or kiki secret so sexy smoothing shine serum.
Just put a drop or so in your hands, rub together & apply

You could also permanently or semi permanently straighten your hair. I tried the Brazilian keratin recently it works pretty well but it washes out eventually.

Waxes, mouse, pomades works for some people, ( i don't like heavy product feeling in my hair , its up to u tho)
Hope that helped a bit <3