It’s possible to make straight hair wavy by blow-drying with a small round brush, or by using heated rollers. If you choose to blow-dry, add a volumizing spray when hair is soaking wet. Air-dry until your hair is 50-percent dry, then use a small round brush with your blow-dryer; the smaller the better. Wrap individual sections around the brush and use the dryer nozzle to force hot air directly onto the brush. Don’t pull; just unwind the brush and let the curl fall into place.
Blow-drying with a round brush adds volume throughout your hair, but hot rollers can quickly create curls that last (and allow you to finish getting ready while they work). To start, add volumizing spray to your hair shaft as well as your scalp before your air-dry or blow-dry. When your hair is fully dry, divide your hair into small sections and roll your hair onto the curlers—keep in mind that the smaller the section and the smaller the roller, the curlier your hair will become. When the rollers have cooled (about ten minutes), remove them slowly without pulling on the hair. Use your fingers to loosely place the curls and finish with hairspray to set them.