<prompt> Cavity varnishes have:average bonding to toothlow bonding to toothexcellent bonding to toothno bonding to tooth  <response>: Cavity varnish is a solution of one or more resins which when applied onto the cavity walls, evaporates leaving a thin resin film, that serves as a barrier between the restoration and the dentinal tubules.Varnishes neither possess mechanical strength nor provide thermal insulation because of the thin film thickness. The film thickness ranges from 2 to 400 μm. The solubility of dental varnishes is low; they are virtually insoluble in water.Ref- Manapallil 3rd Ed P:81 