Some dentists recommend brushing your teeth three times a day, typically after every meal. While this habit certainly can’t hurt, most people have work or school during the day, and it’s not always convenient to carry a toothbrush around for a midday brushing session. For most people, twice a day is enough to keep cavities and gum disease at bay. If you feel compelled to brush your teeth even more often (like after snacks), you won’t necessarily damage your teeth, but the excessive brushing might irritate your gums needlessly.