S traighteners are here to stay – but thankfully, heat styling has come a long way since GHD’s first ceramic straighteners ushered in an era of poker-straight hair in 2001. Today’s models feature adjustable heat settings and protective technology for hairstyling with minimal damage. The looks you can achieve with a straightener have become more versatile as well: one twist of a modern, curved-edge straightener can create styles from ultra-smooth strands to structured ringlets and soft, beachy waves. There’s a wide range of styling possibilities with just one tool. I put a selection of 17 hair straighteners to the test – from budget tools to premium models – and here’s what I found.…