If you had heavy metals in your mouth or anywhere else in your body, the zapper current will move ...
If you had heavy metals in your mouth or anywhere else in your body, the zapper current will move them around, often depositing them into a different organ or part of the body (in the case of mercury, a zapper might deposit it right into the brain... which is why you often see Curezone users claiming their worms "moved to the head"). This redistribution of metals can cause weird symptoms, even a worsening of your condition, if you are not undergoing a chelation protocol. ESPECIALLY if you have had silver fillings in your mouth in the past.
See this page for information on how to chelate properly.
Note that Andrew Cutler makes a big deal about mercury, and claims all autoimmune diseases are caused by it. I had autoimmune disease in my thyroid for years, but in my case mercury wasn't the problem at all (I never had metal fillings), it was other metals. So while I find 99% of his information very good, he unfortunately falls into the trap many other alternative medicine proponents do in claiming he's found "the cure for all illness." In reality he found the cure for a few (very terrible) illnesses, but not even nearly all of them.
Look into Alpha Lipoic Acid for removing mercury. CaEDTA will remove lead and cadmium. Both of these are sold as supplements legally without a prescription in the U.S.. Note that CaEDTA must be taken AWAY from food or it will NOT work.
In the immediate short term you can also try sweating in a sauna. This will remove a ton of toxins, including many kinds of metals, through your skin. I recommend doing it naked, so you can easily wash off the toxins on your skin afterwards - if you must wear clothing, wear clothing you don't mind throwing away.