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.
Allergy shots increase your tolerance to the harmful allergen. By injecting gradually increasing doses of the offending allergen extract, the immune system builds up a tolerance to that allergen. Allergy shots slow down and reduce the production of the IgE antibody.