Entamoeba gingivalis found in the buccal cavity of man causes

The correct option is No disease.

Explanation:
Entamoeba gingivalis is a species of amoeba that resides primarily in the oral cavity (buccal cavity) of humans, particularly in the gingival pockets, tartar, and tonsillar crypts. Unlike its pathogenic relative Entamoeba histolytica (which causes amoebic dysentery), Entamoeba gingivalis is generally considered a commensal organism. This means it lives in association with the host without causing direct harm or disease.

While it is frequently found in abundance in individuals suffering from periodontal diseases such as pyorrhea (periodontitis), extensive scientific research indicates that it does not initiate or cause these conditions. Instead, it opportunistically thrives on the cellular debris, bacteria, and food particles present in already diseased or poorly maintained oral environments. Therefore, it is classified as causing no disease.