Glucosyltransferase inhibitors containing as an active ingredient an extract of fermented tea leaves are described. Illustrative examples of the fermented tea leaves include Oolong tea, black tea and Pu-erh tea. Also described are foods or beverages for the prevention of dental caries, which contain an effective amount of one of such inhibitors. Dental caries can be prevented by taking such foods or beverages.
展开▼