Use a round brush along with your blow dryer to help set your style. Make sure to keep turning the brush in your and let the hair cool before pulling away.
Make sure that you select the right size for your individual needs. Use jumbo and larger brushes for straightening long hair and creating voluminous blow outs as they are easier to control than flat brushes. They are also ideal for smoothing out the longer sections and smoothing ends under in shorter styles.
Use medium and small brushes to add shape and body to the pieces that frame your face as well as to add overall texture and body.