Brush your teeth at least twice a day using a soft/medium brush.

Change your toothbrush every 3-4 months.

Always rinse your mouth after every meal.

Use a tongue cleaner to clean your tongue.

Make sure that you visit your dentist at least once every 6 months.

Make sure you consume plenty of calcium containing items as it is
        good for your teeth as well as bones.

Don't use tobacco products; they can increase your risk of gum disease
        and cancer of the mouth and throat.

Ask your dentist about cosmetic options for improving the appearance of
        teeth that are stained or chipped.