1. Brush and floss more often. Plaque, the sticky buildup on your teeth, collects bacteria that cause bad breath. Trapped food also adds to the problem.Brush your teeth at least two times each day, and floss at least once. If you're concerned about your breath, do both a little more often.Don't overdo things, though. If you brush too hard you can wear down your teeth, making them vulnerable to decay. 2. Rinse your mouth out. Besides freshening your breath, a mouthwash adds ex