Study identifies 'good' and 'bad' breath bacteria

While past research has connected oral malodor to the proliferation of certain bacteria on the tongue, recent research from the Forsyth Institute and the University of Michigan School of Dentistry indicates another group of bacteria is associated with fresh-smelling breath. Investigators used gene sequencing to compare bacteria found on the tongues of individuals with halitosis and those with fresh breath. While not all samples taken from halitosis sufferers had the same bacterial makeup, three particular strains — Streptococcus salivarius, Rothia mucilaginosa and a previously uncharacterized strain of Eubacterium — were the most prevalent species on the tongues of subjects with fresh breath.