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To systematically review the literature about 'What is the global estimated prevalence of dental fear in adults?'. Inclusion criteria were observational population-based studies reporting the prevalence or raw data of dental fear in adults (18 years). Five electronic databases (Embase, PubMed, Scopus, Virtual Health Library and Web of Science) were searched without language restrictions up to March 2020. Two researchers independently performed the study selection, data extraction and quality assessment of the included studies. Risk o