Streptococci causing dental caries:
Streptococci equisimilis
Streptococci mutans
Streptococci pneumoniae
Streptococci bovis
Ans. (b) Streptococci mutans S. mutans: It is member of viridans streptococci (a-hemolytic) which is pa of the normal flora of the oral cavity. It assumes bacillary form in acid environment. Can synthesize acid and large polysaccharide (adhesive dextran or levan) from sucrose.