Entamoeba gingivialis is an amoeba that lives in the human mouth. It is much more prevalent in people with poor dental hygiene or gum disease. It is uncertain whether this creature causes gum disease or inflammation within the mouth and gums, or if it is only feeding on the byproducts of such an infection.
This amoeba exists only in the trophozoite form, and replicates through binary fission. It is transmitted directly between hosts through mouth-to-mouth contact (e.g. kissing) or saliva transfer (such as sharing a cup or utensil).