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My nails look yellow without polish. How do I lighten them?

—Christina Paonessa, Philadelphia, PA

Bobbi: It’s smart to take a break from polish, especially darker shades: Keeping nails covered for long periods of time can cause discoloring. When yellowing becomes a problem, I whiten my nails with a solution of 1 tablespoon of 3% hydrogen peroxide combined with 2 1/2 tablespoons of baking soda. Apply the paste-like mixture onto each nail with a cotton swab, and let it sit for five minutes before rinsing. Then buff your nails to get rid of any remaining discoloration.

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