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Carbon stars are the most relevant dust manufacturers, thus playing a crucial role in the evolution of galaxies. Furthermore, they are living laboratories in which we can test stellar structure and evolution theories of evolved stars. In recent years, important steps forward have been done in characterizing the dust production around these objects, but several uncertainties still affects the robustness of the results. These studies will definitively benefit from the launch of the James Webb Space Telescope, that will revolutionize our understanding of the evolved stellar populations in the Local Universe. To test the capabilities opened by its instrumentation, we studied the sample of Large Magellanic Cloud carbon stars spectra taken by the Infrared Spectrograph onboard the Spitzer Space Telescope. In this talk I will present the results from the comparison between the observed spectral energy distribution and the synthetic one obtained from the AGB+dust evolutionary models computed ad hoc for this study. I will also discuss the best observational planes built with MIRI@JWST filters that must be used in order to obtain the most exhaustive characterization of the individual sources observed.