Hydrox® radiopaque calcium hydroxide paste is a rigid, self-setting cavity liner and pulp capping agent. Hydrox® eliminates all chemical and thermal sensitivity by sealing dentinal tubules and protecting the pulp. It also serves as a protective barrier that insulates the dentin and pulp from acid-containing cements and restorative materials. Hydrox® works well under glass ionomers and will not affect the amalgam or the polymerization of composites. The superior flowability of Hydrox® permits uniform coverage and controlled placement into the preparation.