Dental Implant Glossary Fistula A drainage spot in the gums.  Referred to as a "gum boil" in the past, is a sign that infectious pus is                      draining into the mouth.  Very often people have fistulae with no symptoms at all; however, the                      cause of this drainage must be addressed.  We have recently reviewed a case in which pus from a                      dental abcess entered the lungs and caused a pulmonary abcess which killed the patient. Source: http://www.dentalleaders.com

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