Maybe so, but you'll be trading one problem for a bigger one. Cosmetic dentist to the stars Dr. Jeff Golub-Evans cautions that while lemon juice might lighten your locks, it actually hurts your teeth more than it helps. This is because the citric acid in lemons wears away enamel. The doctor says a smarter way to whiten your smile at home is brushing with baking soda mixed with water a couple of times a week and saving those lemons for lemonade.

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