A study was conducted to sctutinize the precision of a method for in vivo potential and polarization measurements. The variation with time of the magnitude of currents created at contacts between metallic dental restorations of varying age was also studied.The precision found indicates that the method allows for comparatively precise measurements of potentials to be taken. Studies of performed measurements of polarizations show that the precision of these measurements varies somewhat with contact conditions and the areas of restorations examined.The precision of the currents calculated was found sufficient for precise enough calculation to be made of the magnitude of currents created in the oral cavity.The study also shows a decrease with time of the magnitude of currents created at contacts between metallic dental restorations of varying age.