The PoNS™ device delivers electrical stimulation directly to the surface of the tongue. Precautions for use are similar to those for transcutaneous electrical nerve stimulation (TENS). Electrical stimulation SHOULD NOT be used: if there is an active or suspected malignant tumor, in areas of recent bleeding or open wounds, or in areas that lack normal sensation. PoNS™ has not been tested on, and thus should not be used by, individuals under the age of 18 or who are pregnant. PoNS™ should not be used in patients sensitive to nickel, gold, or copper.