"The essential product that I'd need to have always is a serum," she says, recommending Avon's Advanced Techniques Anti-Frizz Capsules ($5). "What I love about it is that you can stick the capsule in your purse. If you're out during the day and you feel like you need a little extra shine or defrizzing, you've got it." Not sure how to use it? "The thicker the hair, you can put it on wet," Shorter explains. "I would not put it on thin or fine hair wet. I would wait until it's dry so that you can really manage the amount you're putting on."