Good oral hygiene habits can go a long way—you might be surprised how much of your tooth discoloration is caused by plaque buildup. Here are some oral care tips to keep your smile bright: If you can’t brush your teeth after red wine, coffee, or tea, at least rinse well with water. If you use tobacco products, quit. Brush your teeth for two minutes, twice a day. Consider upgrading to an electric toothbrush. They do the best job of loosening plaque. Floss your teeth once a day. Go to the dentist every six months for dental cleanings.