Bacteria implicated in dental caries

Ans. is 'a' i.e., streptococcus mutans Viridans streptococci is implicated in causing Dental caries.Various species of viridans streptococci are -S. Salivarius S. Mitis S. Sanguis S. MutansThese bacterias are a part of normal flora of the mouth.They can cause bacteremias through minor trauma such as eating, brushing md flossing, these bacteremias can then cause endocarditis.