How often do I need to wash my makeup brushes?

Gideon Lupine Ask Dr. Moss

Question How often do I need to wash my makeup brushes? Answer Once a month is fine. Dip the brush in warm, soapy water—use shampoo or a mild bar soap. Rinse it, blot the brush with a clean towel, then use a blow-dryer to dry the bristles gently.

I add water to my shampoo to make it last longer. Will it clean as well?

Gideon Lupine Ask Dr. Moss

Question I add water to my shampoo to make it last longer. Will it clean as well? Answer If it’s a concentrated shampoo that really lathers up (and takes a lot of water to rinse out), there’s no harm in adding water, says New York City dermatologist Doris Day. A nonsudsy shampoo could become too watered down to remove oils.