In figure 1 above, the more electronegative Oxygen atoms pull electron density towards themselves as demonstrated by the arrows. Carbon Dioxide is not polar however because of its linear geometry. A molecule's overall dipole is directional, and is given by the vector sum of the dipoles between the atoms.
There are a number of factors that can cause your gums to recede, including: 1  Periodontal diseases. 2  These are bacterial gum infections that destroy gum tissue and supporting bone that hold your teeth in place. 3  Gum disease is the main cause of gum recession.
It is also called periodontal disease. There are two types of gum disease: 1  Gingivitis (say jin-juh-VY-tus) is gum disease that affects only the gums, the soft tissue that surrounds the teeth.  Periodontitis (say pair-ee-oh-don-TY-tus) is more severe. It spreads below the gums to damage the tissues and bone that support the teeth.