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.
Dental Plaque and Gum Disease. A build-up of plaque and tartar (calculus) can lead to inflamed and infected gums. Mild gum disease is called gingivitis and is not usually serious. More severe gum disease, called periodontitis, can lead to teeth falling out.