<unk>  is a Gram-positive, facultatively anaerobic bacteria commonly found in the human oral cavity and is a significant contributor to tooth decay.
The microbe was first described by Clarke in 1924.
Streptococcus mutans
Streptococcus anginosus
Streptococcus viridans
Streptococcus pyogenes
Lactococcus lactis
Staphylococcus saprophyticus
Corynebacterium diphtheriae
Pasteurella multocida