For example, when placing composite materials or sealants, an etchant should be placed before the actual restorative material. An etchant is used to partially demineralize the enamel bars. This is essential for the micromechanical retention of the material to adhere to the tooth surface. If these microscopic cavities were filled by saliva and debris resulting from contact with the tongue, the adhesion process of the material would fail. The oral cavity is a very hostile environment. To achieve maximum functionality of dental materials, the environment must be stabilized. In some cases, stabilization of the oral cavity involves the temporary elimination of these conditions by the tooth