If your fingernails are yellow whether from wearing dark nail polish, wear and tear, or cleaning products, let’s face it, your hands look older. You can brighten yours quickly by cutting a lemon in half. Dip the cut side into baking soda. Gently rub over your nails for about a minute. Then rinse off. The natural acids in the lemon lift off the stain while the baking soda buffs away the discoloration. You’ll have brighter, healthier nails in minutes.