Abstract: Hypoplasia of teeth is a human common dysplasia, including tooth eruption anomaly, number anomaly, and morphology and structure anomaly. Supernumerary teeth represent one of the most common human tooth malformations that exceed the normal number of teeth from dental formula. It can be classified as morphology, including conical, tuberculate, supplementary, and odontomas. The studies show that the prevalence of supernumerary teeth in permanent dentition is higher than that in deciduous dentition, and higher for male than female. Complications associated with supernumerary teeth include dental impaction, delayed eruption, ectopic eruption, the formation of follicular cysts, dilaceration or abnormal development of the root, overcrowding and spacing anomalies. Supernumerary teeth can be associated with cleidocranial dysplasia, Gardner syndrome, and cleft lip and palate. Substantial research related to supernumerary teeth has been conducted. This study aims to provide a review of literature on supernumerary teeth and corresponding analyses of their etiology, clinical manifestation, diagnosis, treatment, and associated disease.

Key words: Supernumerary teeth, Etiology, Clinical manifestation, Associated disease