Periodontists specialize in treating advanced gum disease, and work together with your general dentist to care for oral health by halting the progression of periodontitis and subsequently treating the various forms of gum disease.
What is the origin of an earthquake called in CA? Well, the origin of the earthquake is called the focus, and the point on the ground directly above the focus is called the epicenter. In CA, earthquakes generally originate frâ¦om the San Andreas Fault. Susie Harrell.
What Causes Earthquakes. Earthquakes occur when the rocks (or plates) lying under earth's surface push against each other and break. This can happen with the rocks lying under the landmass, or those under the seawater. This causes earthquakes, during which the rocks move against each other until they settle again.