Brush and floss. Ideally, you should brush your teeth after every meal. At the very least, brush your teeth twice a day and floss daily. Brushing minimizes the accumulation of bacteria in your mouth, which can cause tooth decay and gum disease, Novey says. Flossing, too, helps maintain strong, healthy gums. “The bacteria that builds up and causes gum disease can go straight to the heart and cause very serious valve problems,” Novey explains. Unhealthy gums also can cause your teeth to loosen, which makes it difficult to chew and to eat properly, he adds. To maintain a healthy smile, visit the dentist at six-month intervals for checkups and cleanings.