A species of facultatively anaerobic, Gram positive, cocci shaped bacteria in the phylum Firmicutes. This species is alpha hemolytic, urease and catalase negative, sialidase and alpha glucosidase positive and does not hydrolyze esculin. It can ferment ribose, raffinose, and trehalose but not inulin, cellobiose, mannitol, or sorbitol. S. oralis is found in the human oral cavity and respiratory tract and can be a pathogen that causes dental caries, gum disease, and endocarditis following oral trauma.

A species of gram-positive, coccoid bacteria that is numerous in the mouth and throat. It is a common cause of endocarditis and is also implicated in dental plaque formation.

Any bacterial organism that can be assigned to the species Streptococcus oralis.