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.
1 Inflammation is a complex system by which bacteria-fighting cells of the body are recruited to an area of bacterial infection. 2  Inflammation plays a major role in gingivitis. 3  It is this inflammation of the gums that accounts for most of the symptoms of gingivitis. 4  Bacteria can cause inflammation of the gums.