Below, find her nonnegotiable tips to extend the life of your mani: On that note: “When you have healthy smooth nails, nail polish tends to last longer, so it’s good to buff and shine your nails before applying polish,” Choi adds. When your nails contain grooves and divots, the polish can pool in certain places, which can lead to chipping. Check out these tips to remedy brittle nails and make sure to invest in quality tools, like a glass nail file and nonabrasive buffers to gently reseal the keratin layers. JINsoon’s Effortless Nail Buffer/Shiner, for example, has a double-sided surface with superfine abrasives that smooth and even out the nail surface, as opposed to three-way or four-way shiny buffers that may be harsh on the nails. So I can thank JINSoon’s clean, quality polishes for my shiny, good-as-new mani. “My award-winning, double-patented, high-gloss, rapid drying, vegan, cruelty-free formula contains high-tech polymers and nontoxic resins for longer wear, yet it is 21-free,” she explains. “I wanted to maximize the durability of the polish while eliminating the toxicity, regardless of how expensive the formula would be.” Personally, I’m itching to get my hands on this olive green number—dirty martini nails are a hit this fall. See, top coats help protect the pigment from chipping, but that coat of polish tends to wear off over time, which makes the color underneath more vulnerable. By touching up the top coat, you can reinforce that barrier and keep the pigment intact.