Hypodontia is collectively used to describe the developmental absence of primary or secondary teeth. It is also used to specifically describe the absence of one to six teeth with the exception of third molars. [1-7] Oligodontia is a term used to describe the absence of over six teeth with the exception of third molars. Oligodontia prevalence is seen in 0.08% to 1.1% of the population [1-9]. The absolute failure of one or both dentitions to form in a person is known as total anodontia. [9-15[ The prevalence of hypodontia varies across different regions and populations. This is an important clinical implication of hypodontia as it allows for detection and management of the condition in its initial phases. [1-12[The condition has an adversely influence on the afflicted person as it results in poor facial aesthetics, speech and mastication difficulties, skeletal and dental malocclusion, and periodontal harm. [12-`19[

 In general, dental agenesis may be caused by the arrest of tooth development in the initial bud or cap phase. [12-20[ Care guidelines for such individuals include tooth replacement therapy through fixed and removable prostheses with optional implant support in skeletally mature individuals. [1-20[

Keywords: syndromic hypodontia, oligodontia, ectodermal dysplasia, tooth agenesis

Dr. ABU-HUSSIN M. has given courses and conferences in Spain, Portugal, France, Italy, Egypt, Germany, Croatia, Serbia, Azerbaijan, Hungary, Ireland, Russia, China, England, Austria, Israel, Romania, Mexico,  Brasil, India, Turkey, Dubai(U.A.E.), and USA, and has received awards for his work in International Conferences.   He has been involved in several research programs and has more than 375 publications in Greek and International Dental Journals and has co-authored a textbook for dental treatment of cancer patients.  He has received several awards from the International Association of Pediatric Dentistry, including the Beng Magnuson Award for best research paper and two Bright Smile Bright Future Awards. He has lectured as an invited speaker and participated in more than 280 oral presentations in Greek and International Meetings and has taught in many continuous education courses.  He is a member of various International Scientific Societies and Associations