IF you have any curl in your hair, then you probably fight with controlling your front hairline. i.e. your edges! Well, here are a few tips!
If you have over-curly hair, instead of relaxing . . . . try blow-drying with a round brush that has an aluminum/metal cylinder after you have gotten most of the water out of the hair. I just mentioned three key points. "Aluminum/metal cylinder" will finish ironing out your almost dry hair as it absorbs the heat from the blow dryer. If your hair is too wet, then the brush may cause too much tension and pop. So after you get the edges dry and straight, then use dabs of Miss Jessie's Curly Pudding and a soft boar brush to remoisturize and add shine.
If you have slightly curly hair, then while the hair is wet, you can use a little Paul Mitchell Sculpting Lotion and Paul Mitchell Foam around the hairline then use the Blowdryer to finger massage the hair straight until it is dry!
Less healthy options will include heavy gels, but if you just need a quick fix then some noteworty gels are Hicks Total Transformations "Smooth Edges" as well as NuExpressions styling gel.