While bad breath can be caused by anything from indigestion to an infection in the mouth, high acidity on your gums, lips and tongue can also cause your breath to be anything but pleasant. Therefore, to reduce that acidity, baking soda can be mixed with water and consumed, effectively balancing the pH in your mouth. You can also use a small amount of baking soda as a toothpaste to thoroughly rid your mouth of excess acid. Baking soda is also a soothing substance for your stomach, which can further prevent excess acid and gas production and protect your sweet-smelling breath.