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 (periodontal) disease is an infection of the gums and can affect the bone structure that supports your teeth. In severe cases, it can make your teeth fall out. Smoking is an important cause of severe gum disease in the United States. Gum disease starts with bacteria (germs) on your teeth that get under your gums. If the germs stay on your teeth for too long, layers of plaque (film) and tartar (hardened plaque) develop.