The main work of the teeth is to break food particles into pieces. Regular brushing of teeth is important in order to avoid mouth odor and germs. To have a sparkling white teeth,try this DIY Mix toothpaste, a teaspoon of hydrogen peroxide,a teaspoon of baking soda and small amount of water together. Brush your discolored teeth with it. Do it twice a week for best result. Note: Baking soda and hydrogen peroxide are strong and they can damage the gum. Try it and have a sparkling white teeth again