“Brushes need to be cleaned at least monthly," says dermatologist Joel Schlessinger, MD, founder of LovelySkin.com
. "If they aren't, they become dirty and full of bacteria from constantly touching our skin.”
He recommends utilizing a disposable brush system such as Klix, so you don’t have to worry about regular cleaning. But if you've invested in professional makeup brushes, cleaning them once a week is the best way to keep them soft and make them last longer.
Here's how to clean your brushes: Wet the hairs under the faucet with tepid to warm water. Use a mild shampoo (baby shampoo works great) or liquid hand soap and gently press it through the hairs with your fingers, adding a little water as you go. Rinse and repeat until the water runs clear. Make sure the hairs are pointing down the entire time.
After your brushes are clean, rub them a little on a clean paper towel and lay them to dry on their side. Never leave them to dry with the brush hairs up or in a brush holder. The water can run down in to the ferrule and loosen the glue holding the brush together over time.