Cavities along the gum line are a common thing. A lot of these types of cavities happen along the base of bottom teeth. Reason for this is simply gravity. When you are done eating, or drinking, something the remnants of what didn't get swallowed settle to the floor of the mouth and end up eroding the bottom teeth along the gum line. If you want to know more about the above information please visit at our site Dr Jim Ellis DDS !.