The Solutions: If your curls are too tight... Restyle tendrils by blasting them with a blow-dryer, pulling a medium-size brush through hair to help relax it. If you still have corkscrew curls, mist them lightly with water and blow-dry again.
If your curls are too loose... Heat up hot rollers and reset your hair. When the curlers are in, apply a light spritz of hairspray. Wait until curlers are completely cool before removing them, then let your tresses cool for a minute or two before gently finger combing. Finally, lock the style in place with another mist of hairspray.
The Pro Advice: To make curls last, begin with day-old hair. If you've shampooed recently, use a texturizing spray (ideally one that also protects against thermal heat) before you set your hair in rollers.
Spin the rollers properly for the right crimp. To curl hair at the crown, reel rollers away from the face. For the sides, hold them vertically and roll away. For the back, roll under; pin them into place.