“Exfoliating acid-based toners are a smart method of removing dead skin cells and sloughing the superficial layers of the skin,” says Rachel Nazarian, MD, a dermatologist with Schweiger Dermatology Group. “Regular use can improve the texture of the skin and diminish hyperpigmentation and dark spots caused by ultraviolet radiation and pollution.” The other perk? “They offer a secondary level of cleaning that may not be achieved by basic cleansers for those who may need deeper removal of debris, such as people who wear heavy makeup,” she says. This can be particularly helpful for people with acne-prone skin, as it helps to get rid of every last bit of crap in your pores. If I had a dollar for every time my face dirtied a cotton pad after swiping on my toner (post-cleanse!), I’d be rich enough to create my own line of acid toners." -Well and Good