Crimping is when the hair has many small, sharp waves from the root to tip. While there are many crimping styling tools available in beauty stores or online, if you don't want to make the investment, you can use your hair straightener to create the look. If you make sure to use the proper technique and correct tools, the crimps in your hair will look even and defined just as if you had used a crimper.
Straighten all of your hair with a 1/2-inch flat iron. Gather the top layer of your hair and secure it to the top of your head with a hair clip.
Mist the hair with hairspray. Take a 1-inch section of the hair and place it in between the plates of the flat iron near the root. Clamp the iron and turn it a half rotation away from your face, using your fingers to pull the rest of the piece of hair up and around the iron in the opposite direction. Immediately move a half inch down and rotate the iron toward your face, again pulling the rest of the piece in the opposite direction.
Move your way down the entire piece of hair. Spray the piece with more hairspray and repeat the crimping technique on another 1-inch section of hair. Repeat until the entire layer of hair has been crimped.
Remove the hair clip to release the top section and crimp piece by piece, remembering to spray each piece with hairspray when you are finished.