Greasy Roots One side effect of hotter weather is more sweat and consequently, oilier hair. But you don't want to necessarily get stuck in a pattern of having to shampoo every single day, since that can dry your hair out. The way you shampoo matters, too. It's also not a good idea to overly scrub your scalp because this increases sebum production, Donovan says. "Initially your hair will feel clean, but the oils will come back super-quick," he says, adding that you should be very gentle when massaging shampoo into your scalp.
If you notice greasy roots, reach for dry shampoo. "It's a good option to absorb oil," Donovan says. Some dry shampoos can be harsh and sticky, so he recommends choosing one that has a lighter formula. We like Batiste Original Clean & Classic Dry Shampoo, $5.99. You can switch to a heavier product the next day if you need more oil absorption, says Donovan.
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