Ghost Teeth, also known as “Regional odontodysplasia (RO)”, is a rare developmental anomaly that occurs in approximately five percent of people. The reason regional odontodysplasia is called "ghost teeth" is because the teeth from this condition appear "ghost-like" on radiographs. "Regional" in the name is due to the fact that it mostly occurs in a restricted area of tooth development, usually in one part of the mandibular or maxillary arch and not crossing it. "Dysplasia" is a term describing abnormal growth of cells, bone, or in this case, teeth. The best way to understand this term is to break down the term (Regional odontodysplasia) into its parts. -Regional: It affects the adjacent teeth in one or more areas. -Odonto: It refers to dental issues. -Dysplasia: It refers to the presence of abnormal growth of cells in organs or tissues in your -body.