Inside Beauty

You might not be cleaning them often enough. Letting brushes sit with product on them for too long can permanently damage the bristles, says makeup artist Fiona Stiles. She suggests washing them once a month with dish detergent, which breaks down the oils and pigments that build up in the hairs. How you dry your brushes is critical too. After a rinse, lay them flat on a paper towel. "If you put them upright in a cup, water can seep into the base and rot the brush," says makeup artist Jake Bailey.

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