Tooth filling material or dental varnish comprises (a) one or more 2,3-dihydroxy-6,10-dimethyl-12-oxacyclododecan-1-one compounds (I) as an active substance for inhibiting the formation of biofilms of Streptococcus mutans, (b) a material for forming a structure for the uptake and delayed release of the active substance comprising one, two, three or more polymerizable monomers, (c) one or more fillers and (d) one or more additives comprising initiators, accelerators and inhibitors. Tooth filling material or dental varnish comprises (a) one or more 2,3-dihydroxy-6,10-dimethyl-12-oxacyclododecan-1-one compounds of formula (I) as an active substance for inhibiting the formation of biofilms of Streptococcus mutans, (b) a material for forming a structure for the uptake and delayed release of the active substance comprising one, two, three or more polymerizable monomers, (c) one or more fillers and (d) one or more additives comprising initiators, accelerators and inhibitors. R1-R4 : 1-12C alkyl (optionally branched), preferably methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-heptyl, isoheptyl, n-pentyl, isopentyl, n-hexyl or isohexyl, optionally branched or cyclic, and optionally saturated 7-12C aryl or aryl, arylalkyl or an additional aryl group, or H; and X : O or OH, where the boldly emphasized lines between the carbon atoms 7 and 8 and between the carbon atoms 15 and 16 represent a single bond or a double bond independently of each other, and the boldly emphasized line between the carbon atom 5 and the group X, provided that X is OH, a single bond, O and a double bond. Independent claims are included for: (1) producing the tooth filling material or dental varnish, comprising providing or producing the components (a)-(d), and optionally providing or producing one or more additives comprising silver, substances releasing silver ions, copper, substances releasing copper ions, zinc and substances releasing zinc ions, one, two, three or more softeners, preferably polyethylene glycol as the softener and/or one or more other constituents, and mixing the components provided and/or produced; (2) a Kit comprising the tooth filling material or dental varnish, and one or more additional constituents comprising adhesives, abutments, implants, forming tools, impression materials, color scales, color guides and light hardening devices; (3) use of (I) or an admixture comprising (I), for producing a tooth filling material or dental varnish; (4) producing a dental prosthesis, which inhibits the biofilm formation, comprising providing the dental prosthesis, providing or producing the tooth filling material or dental varnish, applying the provided or produced tooth filling material or dental varnish to the dental prosthesis, optionally forming the applied tooth filling material or dental varnish on the dental prosthesis, optionally hardening, or allowing to harden of the applied tooth filling material or dental varnish, which is optionally formed, on the dental prosthesis and optionally further post-treating the hardened tooth filling material or dental varnish on the dental prosthesis, preferably by polishing and/or grinding; and (5) producing a dental component, which inhibits the biofilm formation, comprising providing or producing the tooth filling material or dental varnish, forming the tooth filling material or dental varnish, hardening, or allowing to harden of the formed tooth filling material or dental varnish and optionally further post-treating the hardened formed tooth filling material or dental varnish. [Image] ACTIVITY : Antibacterial. MECHANISM OF ACTION : None given.