A BisGMA-derived degradation product affects gene expression of cariogenic bacteria. Resin composite degradation product affects gene expression of cariogenic bacteria. A BisGMA-derived biodegradation product affects virulence of S. mutans. Resin composite biodegradation product affects virulence of S. mutans. A BisGMA-derived biodegradation product regulates biofilms-related proteins/enzymes.