Some people may brush their teeth twice a day but still not get the full benefits of brushing since they are not brushing incorrectly.  When brushing your teeth you want to make sure you tilt your brush at a 45 degree angle against the gum line. Sweep or roll the brush away from your gum line. Gently brush the outside and inside of your teeth make sure you brush the chewing surface of each tooth using short back and forth strokes.

When you finish brushing your teeth gently brush your tongue this will help to remove bacteria and also freshen up your breath.  If you are not sure if you are brushing correctly ask your dentist to show you.  This is not a silly question since preventive dental care starts at home.