After eating highly acidic foods, your teeth are susceptible to damage. When you brush your teeth in this weakened state you are actually damaging your enamel. The abrasive bristles of the brush wear away the protective surface of the teeth. You should avoid brushing for at least an hour, or take other, simple preventive measures immediately following a meal.
First, rinse with or drink clear water. Then chew some sugarless gum. Both of these practices will produce saliva, restore a healthy pH level in your mouth, and coat your teeth with nourishing minerals. Out of all the sugarless gums available, the best of the best are those that list xylitol as the first ingredient. Another option is to consume cheese, milk, or another non-acidic food or drink to conclude your meal.
After you have given your mouth time to return to a healthy pH, feel free to brush your teeth. Just keep in mind that any time you eat acidic foods, you weaken your teeth. Make sure not to worsen the problem by brushing immediately after dining and damaging your teeth even more.