Citrus Fruits

Lemons, limes, oranges, and grapefruit are typical citrus fruits that are high in the antioxidant vitamin C. Vitamin C in citrus fruits is very important for maintaining collagen in your gums, but too much collagen can also have a big effect on your teeth.

"If you regularly eat a lot of citruses, drinking lemon water every day can also soften and erode your enamel," says Mr. Jablow. A 2011 study published in the British Journal of Nutrition found that grapefruit juice can be as harmful to teeth as drinking Coca-Cola. About 20 minutes after eating citrus fruits or drinking a glass of lemon juice, you should brush your teeth to remove the amount of acid on your teeth. If you brush your teeth immediately after eating this food, it can wear down teeth faster, Mr. Jablow warns.