Attach a Nozzle
Attaching a concentrator nozzle to your blow dryer can do wonders for minimizing frizz. The nozzle creates distance between the hair and the lip of the dryer, which is the hottest point of the hair tool. So instead of dispersed air flow hitting your strands from all directions, it concentrates the air flow against the hair.
"Hold the nozzle downward, pointing it down the hair shaft while you blow-dry," Vaccaro explained. By positioning the nozzle in a downward direction against the hair, air flow will be focused on smoothing down the cuticle to minimize frizz.