OLD RULE – BRUSH AFTER MEALS
Bad idea if you’ve just had a very acidic food or drink (e.g., soda, citrus fruits, tomatoes, wine, coffee, tea). Acid weakens tooth enamel, so you may scrub it away.
FRESH THINK – SWISH & WAIT
To get rid of food particles, rinse with water after a meal. You should then brush 30 to 60 minutes later, once your tooth enamel has had a chance to reharden.