A kind of mouth rank piece for providing the noninvasive nerve modulation of patient. The mouth rank piece includes: thin-long casing, and center of gravity is located at the rear portion of thin-long casing One is attached to the locating pad of the outer top surface of the thin-long casing, for minimizing the contact between the upper tooth of patient and the outer top surface of thin-long casing One is installed on the printed circuit board of thin-long casing bottom part, which has the multiple electrodes for subcutaneous local electrical stimulation to be transferred to patients tongue. In some embodiments, the mouth rank piece further includes at least one locator being arranged along the front area of the thin-long casing, ensures that the mouth rank piece is positioned in patients mouth for the upper tooth contact with patient.
