If you are suffering from any chronic health problem, try looking in your mouth for a possible cause. If you have any metal in your mouth, whatsoever, consider finding a dentist who can remove it safely and replace the material with a safe composite containing no metal. Possible sources for metal include fillings, crowns, root canals, bridge work, partials, and implants.
Make a daily habit of sterilizing the wet sponges and wet cloths you use in the kitchen. One easy way to sterilize these materials is by microwaving them for 3 minutes. Make sure they are damp before placing them in the microwave.
If you are suffering from any G.I. tract problems, try considering that you are a host to parasites and take an herbal remedy to eliminate as many as possible. Black walnut hull liquid extract is one example of a remedy to kill certain parasites.