Fact: One studyrevealed that whereas blow-drying hair causes extra harm to the hair surface, air-drying hair can cause damage throughout the strands themselves. When your hair is uncovered to water for prolonged intervals of time (let say, the hour it takes to your hair to dry on its own), it swells up and puts stress on the proteins that keep your hair intact. Your best wager? Air-dry until hair is about seventy five p.c of the best way there. Then, put your dryer on a low heat setting and dry the rest of your hair to complete.