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.
When there is an outbreak of cancer cells that invade the gums, it is known as gum cancer. Gum cancer is one type of oral cancer, but thankfully, it is also a rare form of cancer in general. If a dentist and patient are able to catch it early, treatment can lead to curing the cancer.