Rather than using Mineral Trioxide Aggregate, dentists can use Nano Fast Cement (NFC), a nanocomposite with a rapid curing time for filling root canals in teeth. The new tooth restorative material has poor workability and low compressive strength, which is a major drawback. In order to enhance its physical, mechanical, and biocompatibility features, NFC was modified in this study by adding polyvinyl alcohol (PVA), colloidal nano-silica, and hydroxyapatite nanoparticles. The strength-enhancing effects of all three compounds were analysed. The Taguchi method was used to create the experimental setup. Compressive and flexural strengths were maximised by finding the sweet spots for the three additions. The results demonstrated that polyvinyl alcohol is the most influential factor in determining the mechanical (compressive and flexural strength) qualities of NFC. Taguchi analysis shows that the best mechanical properties come from a mix of 6% PVA, 0.5% nano-silica, and 0% nano-hydroxyapatite.