People have been talking about using electrical current directly in the mouth using wires or pads to carry the current.
Current directly in the mouth never felt good to me. So here's what I do: I put electrode patches on the OUTSIDE of either cheek, or somewhere at the jaw where the pain is the strongest. Inside my mouth is salt water that I hold for the duration of the session. The salt water ensures good conduction, as the electrical current does reach all areas of the mouth. I make sure to start with my mouth about half filled with salt water, because by the time the session is over my mouth is completely filled with liquid on account of increased saliva production. Of course, I spit out the water when I'm finished, into the trash. Each session ranges from 30 - 60 minutes, however long I can hold the salt water. Even after one session I feel relief. For these sessions, I use a portable frequency generator (a rife machine) that I wear around my waist. Frequencies used are commonly all below 1000 hertz. This is important, because the lower frequencies have longer wavelengths and so pass through thicker structures than the higher frequencies do. However, within these parameters, it appears that more important than the frequency itself is the salt water, which conducts the current. I suppose a zapper-type instrument or the Tennant Biomodulator (which I own and use a lot) would suffice as well. Nenah Nenah Sylver, PhD author, the NEW Rife Handbook (2011) Holistic Handbook of Sauna Therapy (2004) VoiceBio and Biomodulator certification <http://www.nenahsylver.com> www.nenahsylver.com; <http://www.rifehandbook.com> www.rifehandbook.com