Truth: One examine revealed that whereas blow-drying hair causes extra harm to the hair’s floor, air-drying hair can cause harm inside the strands themselves. When your hair is exposed to water for prolonged intervals of time (let’s 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 greatest guess? Air-dry until hair is about seventy five p.c of the way there. Then, put your dryer on a low heat setting and dry the remainder of your hair to finish.