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.
Initially, they may simply irritate and inflame the gingiva, the part of your gum around the base of your teeth. This is called gingivitis, the mildest form of periodontal disease. Ongoing inflammation eventually causes pockets to develop between your gums and teeth that fill with plaque, tartar and bacteria.