Jennifer Lopez

Photo: Getty Images/Alberto E. Rodriguez

5 of 7
If you want stick-straight hair...

The tool for you: Straightener, professional grade.

Why: Professional straighteners have a dial that allows you to adjust the heat, so you can change the level depending on whether your hair is coarser or finer, Gibson says.

How to get the look: When straightening your hair, make sure it's completely dry before you start, whether naturally or from a dryer. Then, separate the hair into 1/2-inch sections—"you should spend about 20 minutes sectioning off the hair" in prep for optimal straightness, Gibson says—and take your time flattening each section. Chastain adds that you should start all the way up to the root with the straightener, clamping it and ironing the hair from top to bottom of each section for a dramatically straight style.