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.
Bleeding gums is symptomatic of a periodontal gum condition called gingivitis. Flossing the in between area of the teeth removes bacterial plaque which causes the tissue irritation and the bleeding. Keep flossing and the bleeding should stop over a period of a week or so. If it does not there may be a hard deposit called calculus or commonly called tartar present that simple flossing cannot remove.