I have thin straight hair, but they seem to get messy, once I move out of my house. I donât want to try anymore hair straightener on my hair, as they have made my hair even more thin. I was wondering if I could use any hair-straightening product on my hair to make them straight and look non-messy! However, I am apprehensive about using them, as I am already using leave-in conditioner from Garnier Fructis, and I am not sure whether another product would add to the greasy thing onto my hair or it would solve my hair problems. Can some hair expert please advice aptly on its use? I would be thankful to you for an appropriate advice!