This book consists of five chapters that explore the diagnosis to treatment of maxillary sinus diseases. The aim of Chapter One is to discuss some of these rare and uncommon pathologies of maxillary sinus and their management. Chapter Two serves as a comprehensive guide for clinicians, researchers, and dental healthcare providers involved in the multidisciplinary care of individuals at risk for odontogenic-related maxillary sinusitis. Chapter Three provides a comprehensive overview of maxillary sinusitis in the context of dental infections. The rare condition, maxillary sinus hypoplasia, is discussed in Chapter Four. The last chapter reviews maxillary sinusitis of dental origin.