If a plate with oceanic lithosphere meets another plate, the dense oceanic lithosphere dives beneath the other plate and sinks into the mantle: this process is called subduction. The sinking oceanic lithosphere drags the rest of the tectonic plate: this is the main cause of plate motion.
You may notice a decrease in symptoms during the build-up phase, but it may take as long as 12 months on the maintenance dose to notice an improvement. If allergy shots are successful, maintenance treatment is generally continued for three to five years.
The allergist will prepare a schedule for your allergy shots. It is extremely important that you adhere to this schedule. At first you will get the shots often, once or twice a week. After about 6-12 months, you will start maintenance therapy, which means a shot about every month or so. Most people continue to take maintenance therapy for 3-5 years.