In this video Megan shows how a curling iron can be used to make small changes to straight hair. She applies Heat Tamer Spray by Tresemme to her hair before starting. She also recommends using a conditioner on your hair if you have split ends.
To add thickness to your bangs, simply roll the hair in that area in the curling iron, and roll it down. To create waves just in the ends of the hair, roll it straight up as far as you want the curl to go, and pull it down. Be sure to roll straight and not on an angle. She also demonstrates rolling the hair vertically to create a different style of curl.