Mercury acts as an antibiotic, and was used in some medicines until safer alternatives came along for this purpose. In the body mercury also acts as an antibiotic, and like medicinal Antibiotics it kills off the beneficial bacteria which repel parasites and aid in digestion. Yeast overgrowth with its attendant symptoms of fatigue, sweets cravings and vaginal infections is often traced to the Antibiotic effect of dental mercury. Suspect this as a root cause when yeast is a continuing problem in spite of repeated treatment. The symptom (yeast overgrowth) will not likely go away until the root cause (mercury) is dealt with. The effect of dental mercury on normal gut flora is well documented].