Wang J, et al. - Here, the clinicians incorporate an antibacterial agent derived deep eutectic solvent (DES) into a dental resin composite. Furthermore, they examine the resulting mechanical properties and antibacterial effects. Without sacrificing the intrinsic mechanical properties of the composite structure, the incorporation of a benzalkonium chloride (BC)-based DES into a dental resin composite provides a new strategy to develop antibacterial dental materials with better biocompatibility and longer effective lifetimes.