Though you may think it gets the job done quicker (and it may) blow-drying your hair on the hottest setting is not good for your hair. It’s best to adjust your blow-dryer’s heat setting and airflow setting depending on your hair type. For fine or thin hair, a low to medium heat and airflow setting is ideal. Thicker hair can withstand a bit more heat and a lower airflow setting. And no matter what heat setting you use, be sure to finish off with a blast of cool air to add shine.