In an in vitro study, DGL was effective at inhibiting a strain of Streptococcus mutans and preventing biofilm formation. Researchers suggest that the antimicrobial effects of DGL on S. mutans could lead to the development of DGL oral hygiene products.
Ahn S-J, Cho E-J, Kim H-J, et al. (2012). The antimicrobial effects of deglycyrrhizinated licorice root extract on Streptococcus mutans UA159 in both planktonic and biofilm cultures. Anaerobe. 18(6): 590-6