How can you keep your hair straight when you straight it?
cause mines always gets wavy;(
You can either use a hair straightener to straighten your hair out or get a straight perm.
avoid humidity that's what really gets my hair to poof when I straigten it, other wise just use a non-oily hair product after you straighten it. Hope I helped :)
Use a flat iron that goes to about 200 degrees celcius, use heat protection beforehand and obviously avoid heat ( sweating, humidity). Make sure you straighten your hair in sections and go over parts that aren't perfectly straight.