This document discusses various conditions related to abnormalities in white blood cell counts, including leukopenia (low white blood cell count) and leukocytosis (high white blood cell count). It provides details on specific types of leukopenia such as agranulocytosis and cyclic neutropenia. It also covers causes and clinical manifestations of these conditions as they relate to the oral cavity. Additionally, it discusses leukocytosis and associated diseases like infectious mononucleosis and various forms of leukemia.