You should ideally either brush your teeth just before eating, or wait at least an hour after a meal before brushing. This is in order to prevent tooth erosion.

How does tooth erosion work?

Many foods contain acids, especially fizzy drinks (including fizzy water) and fruit juice. When you eat or drink these foods, your teeth are exposed to this acid which then slightly softens the tooth enamel. Therefore, it’s best not to brush immediately after eating since the tooth enamel will be the softest at this time. Rather wait an hour before brushing.

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