The established multiple-visit treatment for necrotic teeth with apical periodontitis has been challenged by single-visit treatment. However, there is no clear support for the one or the other treatment in the literature. The aim of this meta-analysis was to investigate if non-surgical primary root canal treatment carried out in single-visit or multiple-visit makes any difference in terms of radiographic healing in necrotic teeth with apical periodontitis. The null hypothesis was: there is no difference in the rate of apical healing for the two treatment modalities The literature search was organized through the National Centre for Biotechnology Information (NCBI) at the U.S. National Library of Medicine (NLM the National Library of Medicine (NLM)) using PubMed database and EMBASE Ovid to select articles with single-visit or multiple-visit included teeth with pulp necrosis and apical periodontitis. Of the 60 identified studies, only eight studies were included in current meta-analysis. The main reasons for exclusions were teeth with other diagnosis except necrotic pulp and apical periodontitis, studies with no comparison between single- and multiple-visit endodontics within the same study and studies without healing rate appearance. Results from each of the included studies were entered into the statistical program Stata, Version 15 (Texas, USA). The odds ratio (OR) and the 95% confidence interval for each study were calculated (dependent variable: single-visit/multiple-visit, independent variables: healed/not healed based on intra oral radiographs) with the random effect model. There was no significant difference in radiographic evidence of periapical healing between single-visit endodontics and multiple-visit treatment modalities, of the primary root canal treatment in necrotic teeth with apical periodontitis (OR = 1.10, 95% CI: 0.67-1.83) as evaluated on intra oral radiographs. Thus, the null hypothesis could not be rejected.