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.
Gum disease (periodontal disease) means infection or inflammation of the tissues that surround the teeth. Depending on the severity, gum disease is generally divided into two types - gingivitis and periodontitis. Gingivitis means inflammation of the gums. Most cases of gingivitis are caused by plaque.