Hydrate your hands with a petrolatum-based cream to lock in moisture. At night, massage cuticle oil around the edges of your nail beds to prevent breakage. To smooth out a rough, wavy surface, apply a treatment before polishing; try OPI Ridge Filler (3), $8.50, opi.com for stores. Every few weeks, skip the lacquer and buff your nails instead (try Tweezerman Shape and Shine Nail Tool, $7, tweezerman.com). "It gives nails a shiny finish and a chance to air out," says Choi.
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