Electrochemical techniques involving potentiostatic and potentiodynamic (hysteresis) polarization have been employed to evaluate the corrosion resistance of dental amalgams and dental casting alloys in a 1.0 percent sodium chloride solution, Unlike conventional dental amalgams, where corrosion is associated mainly with the presence of the tin-mercury (γ2) phase, the corrosion of γ2-free dental amalgams results from the presence of silver-copper eutectic or copper-tin or both. The corrosion of silver-base and gold-base dental casting alloys stems from the presence of silver-rich microsegregations with a possible minor contribution from a copper-rich phase. These results agree with the results obtained from long-term laboratory and clinical studies and thus demonstrate the usefulness of relatively quick, convenient electrochemical techniques in the evaluation of the corrosion resistance of dental alloys.