Do not brush your teeth immediately after meals & drinks, especially if they were acidic. Acidic foods—citrus fruits, sports drinks, tomatoes, soda (both diet & regular)—can soften tooth enamel "like wet sandstone," says Howard R. Gamble, immediate past president of Academy of common Dentistry. Brushing your teeth at this stage can speed up acid's effect on your enamel & erode the layer underneath. Gamble suggests waiting thirty to sixty minutes before brushing.
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