Dens invaginatus (DI) is a tooth abnormality first described by Socrates in 1856 (Hulsmann, 1997). The etiology of this malformation remains unknown, and it resulted in an invagination of the enamel organ into the dental papilla before mineralization of the tooth structure (Nosrat & Schneider, 2015). It will cause the weakness of enamel , which can easily lead to pulp infection. The clinical symptoms of DI may not be typical, by analyzing the incidence of DI in the population can alert the clinicians of the existence of this kind of teeth malformation and help improve the early diagnosis rate of DI.The prevalence of DI is 0.25%-10% in the general population . The variation in the prevalence may be caused by the different cohorts studied, identification criteria used, and diagnostic difficulties . Invaginated teeth were usually presented as case reports in the literature. There are a limited number of studies reporting the prevalence of DI, in which

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