Know Your Limits If your medicine cabinet is full of hair serums, sprays and masques (guilty), you'll have to go on a product fast. "People always think you need dry shampoo, but really the more product you use, the dirtier your hair gets," Mika says. Instead, arm yourself with just two beauty tools: a boar bristle brush and shower caps. The boar bristle brush will give more than one with synthetic fibers to smooth the hair. And when you're in the shower, double up on shower caps to keep hair from getting frizzy in the humidity. (Since Paulina had no shower caps on hand, she skipped the showers and took baths instead.)
However, just like diets, you get cheat days. If you have extra dry hair, you can use a serum or light shine spray, but overall it's better to skip product. You can also apply a little leave-in conditioner just on the ends of hair to touch up a "stale" blowout and add polish. To keep bangs from lying flat against your forehead, Mika recommends using a light finishing spray like Schwarzkopf Professional Osis Plus Elastic Finish, $18, sprayed on a finishing brush or paddle brush to comb through your bangs and add volume.
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