Introduction: Mineral trioxide aggregate (MTA) is one of the most popular and convenient material among current endodontic materials. In addition to MTA advantages, there are also features that need to be improved. Color stability and consistency are notorious concerns in MTA, and materials need improvement regarding theses aspects. There are companies, which work on these contents. Objectives: The aim of this study was to investigate the cyto-toxicity of Biodentine, Angelus MTA, BIOfactor MTA on 3T3L-1 fibroblast, and Saos-2 osteosarcoma cell lines with different dilution of all products. Material and methods: 3T3-1 fibroblast was applied to stimulate pulp cells in cell viability test. In order to generate an osteoblastic cell-like model, only Saos-2 cells were used. MTT test was utilized to measure cell cytotoxicity in different dilution of all MTA products. SPSS package program was applied to perform Kruskal-Wallis, one-way ANOVA and two-way ANOVA tests. Results: According to results, while Biodentine, Angelus MTA and BIOfactor MTA showed cyto-toxic effects in 1: 1 and 1: 2 dilutions, they were not cyto-toxic in 1: 4 and 1: 8 dilutions. Conclusions: MTA products have similar cyto-toxicity. BIOfactor MTA has a cyto-toxic effect as other similar products.