As a general rule, you should use natural bristle brushes.
Beyond this your hair will determine the type of brush you should use.
For more bounce and a tighter wave, select a smaller round brush.
For a sleek, straight finish, opt for a thick, large round brush.
For very curly hair a paddle brush is best.
While hair is damp, pull the brush from the roots, with the dryer directed
at the roots to pull out the frizz. Once hair is dry, section it off and smooth
it around a large, round brush for a frizz-free finish.
reference:The AWW beauty team