tooth abscess A tooth abscess forms around the tip of the tooth's root.  This will cause the tooth to ache constantly, and be extremely painful to chew on.  If the abscess is left untreated, it will begin to erode the bone around the tooth, and may lead to the formation of a small path, or canal, through the bone and its overlaying gum.  Just before the path (fistula) reaches the surface of the gum, a swelling, or boil may form.  This can persist, or burst releasing foul tasting pus into the mouth.     Tooth decay usually does not pose a serious health risk if treated early however, if the decay is allowed to progress, the tooth will likely die, and the spreading infection may result in general blood poising, fever, swelling in the face and neck, and a general feeling of unwell.  The best treatment is preventative through proper brushing, flossing, and dental visits. Then the chances of significant dental decay are greatly reduced.  Sealants can also be used as a good preventative measure.