Ever wonder why there are so many different brushes? Here’s a rundown of brush buying basics. Start with shape: flat paddle brushes are great for detangling, reducing static and styling without adding much volume. (Thick, long hair? This one’s for you.) Round brushes are for styling with a blow-dryer for countless looks ranging from bangs to loose waves to voluminous, straight locks. Remember, the smaller the barrel, the tighter the curl. Then choose a material that fits your hair’s needs.