J Dent (Tehran). 2014 Nov;11(6):703-10.
Role of aqueous extract of Morinda citrifolia (Indian noni) ripe fruits in inhibiting dental caries-causing streptococcus mutans and streptococcus mitis.
Kumarasamy B, Manipal S, Duraisamy P, Ahmed A, Mohanaganesh S, Jeevika C.

Noni fruit aqueous extract effectively inhibited the growth of Streptococcus mutans and Streptococcus mitis in vitro. (original abstract available online at https://www.ncbi.nlm.nih.gov/pubmed/25628701).