Your orthodontist will give specific instructions, but in general, you should brush for two minutes after every meal or snack, and before bed. Carry a travel toothbrush and small tube of toothpaste with you so you can brush when you’re away from home. Bring along floss and an interproximal brush, too. If you’re in a pinch and absolutely are not in a position to brush after eating or drinking  at the very least rinse with plain water. It can help you get rid of some food particles or traces of beverages.