Floss your teeth daily. Flossing cleans those areas your toothbrush simply can't reach between the teeth and under the gumline. Eat, drink, but be wary. Avoid sweet foods and drinks especially between meals. And please don't smoke.
Smoking can promote serious dental problems like gum disease and oral cancer.
Check your gums. See your dentist if any occur. Don't wait until it hurts. See your dentist for preventive checkups and professional cleanings. Regular visits are the best way to prevent trouble and unnecessary expense.