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.
Gingivitis usually refers to gum inflammation while periodontitis refers to gum disease and the destruction of tissue and/or bone. Initially, with gingivitis, bacteria plaque accumulates on the surface of the tooth, causing the gums to go red and inflamed; teeth may bleed when brushing them.