i have very thick hair, thick hair that has a mind of it's own and likes to not curl or ringlet - that likes to get awful waves in! ugh. i'm forever straightening it.
when i go the hairdressers now i always ask for it thinned out and she really takes alot off i also ask for very short layers put it - i know it goes against what you'd think but it honest to god does make my hair easier to handle and it keeps straight for longer than it did when it was long - i hate when my layers are growing out because the ends just don't lie straight at all.
i say just go for it - go for a change and if it is honestly that bad then there's straightners you can carry around in your bag, there are plenty or hair serums you can use too.
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