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.
A gum abscess (also called a periodontal abscess) usually is caused by an infection in the space between the tooth and gum. The infection may occur after food gets trapped between the gum and tooth. In people with severe periodontal disease, bacteria can build up under the gum and in the bone. A tooth-related abscess (also called a periapical abscess) occurs inside the tooth. This happens when the tooth's nerve is dead or dying. This type of abscess shows up at the tip of the tooth's root.