Never brush your teeth just after a meal

Most of us believe that proper dental care means flossing and brushing often — at a minimum, twice daily. Those who are particularly diligent may brush more often, after meals, snacks or sugary drinks.
But research shows that brushing too soon after meals and drinks, especially those that are acidic, can do more harm than good. Acid reflux poses a similar problem: While it might seem like a good idea to brush after a reflux episode, doing so can damage your teeth.
Acid attacks the teeth, eroding enamel and the layer below it, called dentin. Brushing can accelerate this process. With brushing, you could actually push the acid deeper into the enamel and the dentin.
Researchers suggest that we should not brush immediately after an acidic meal or drink. It is always to wait at least 30 minutes. In the meantime, to get rid of acid, they suggested rinsing the mouth out with water or using an acid-neutralizing mixture: one part baking soda, eight parts water.

Source: The New York Times