For healthy teeth, do not brush when feeding

Don't brush your teeth directly when meals and drinks, particularly if they were acidic. Acidic foods—citrus fruits, sports drinks, tomatoes, soda (both diet and regular)—can soften enamel "like wet arenaceous rock," says Howard R. Gamble, immediate past president of the Academy of General medicine. Brushing your teeth at this stage will speed up acid's impact on your enamel and erode the layer beneath. Gamble suggests waiting thirty to hour before brushing