Hair straightners, esp GHDs are the BEST invention in the world (well apart from bread, the tyre, the automobile, space travel etc-but they can't straighten your hair.)
My GHDs turn my frizzy, unruly mop into glossy silkey locks, if you use the hair oil they don't dry out hour hair and if you uses a little serum afterwards it waterproofs your new style against damp, drizzle, moisture etc.