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.
If the root cause of your gum swelling is gingivitis, good oral hygiene is the first step to recovery. Improve your diet. Add some extra fruits and vegetables to your diet, and avoid caffeinated beverages and sodas for a while. Rinse your mouth with a salt water solution. This can ease the pain of inflamed gums. See your dentist! Be sure to make an appointment if your gum irritation persists. A dental professional can determine the exact cause of the swelling, and help you improve the health of your teeth and gums faster.