Which type of brush is mostly used for curling hair?

The barrel brush is primarily used for curling hair due to its cylindrical shape, which allows for the creation of curls and waves when used with heat. Its design facilitates a natural wrap of the hair around the brush, helping to enhance volume and shape. This type of brush typically features a mix of bristle types, which can help in both curling and smoothing the hair as it adds shine and reduces frizz during styling.

While round brushes can also aid in curling, especially for larger curls, the specific design of the barrel brush enhances the ability to create and maintain curls more effectively, making it the preferred choice among professionals. Flat brushes and paddle brushes are more suited for straightening hair or detangling and wouldn’t provide the same curling capability as a barrel brush.