Below are some foods and drinks that you can make sure you include in your diet each day to keep your teeth healthy. This added to daily brushing and flossing can keep away bacteria that can cause cavities. Cinnamon If you have some cinnamon flavored chewing gum, you can chew a piece to fight bacteria on your teeth and in your mouth.  Cinnamon contains anti-bacterial properties. You will often find cinnamon oil in toothpaste and mouthwashes.