The frequency of washing your makeup brushes depends on several factors, including how often you use them and what type of products you use with them. As a general guideline:
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Foundation brushes should be washed at least once a week, or more often if you use them every day.
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Powder brushes can be washed less frequently, about once a month, as they tend to have less product buildup than other brushes.
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Blush, contour, and bronzer brushes should be washed about once every two weeks, or more often if you use them frequently.
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Eye shadow and eyeliner brushes should be washed at least once a week, or more often if you use them daily.
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Lip and concealer brushes should be washed after each use to prevent the buildup of bacteria and product.
It is important to wash your brushes regularly to remove any bacteria, dirt, and makeup buildup, which can cause skin irritation and breakouts. Using a gentle brush cleaner or soap and warm water, gently lather the bristles and rinse thoroughly, then lay the brush flat to air dry.