You may choose to skip a morning cleanse, especially if your skin is running dry—but a nightly wash is non-negotiable. “If you only want to [cleanse] once a day, do it at night so you can take all the pollution off before you go to sleep,” board-certified dermatologist Jeanine Downie, MD, says regarding how often you should wash your face. You see, pollutants and daily grime build up on your skin as the day goes on, which can contribute to oxidative stress, dull, crepey skin, and fine lines if you don’t cleanse before bed. “Pollution can subject the skin to…

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