THE best straighteners for thick hair can tame the most unruly locks to give you star-worthy sleekness. Read on for our round-up of the best straighteners for thick hair – with a range of brands to suit you, whatever your budget. Hair straighteners are a must-have for many to tame fly-away or frizzy hair – or just to keep your tresses in a super-sleek style for longer. Those with thick, coarse...