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.
The next stage of gum disease is called periodontitis, when the gums begin to detach from the teeth, pockets form, and damage to the underlying bone begins to occur. Once pockets have formed, plaque begins to accumulate there, making it very difficult to control further tooth and gum decay.