Dental Materials are specially fabricated materials, designed for use in dentistry. Dental Materials should have certain characteristics to be effective in dental health maintenance. Characteristics which are particularly important are safety and compatability with oral tissues (non-irritating), as well as longevity. Dental Materials and devices are regulated for safety and efficacy by the Food and Drug Administration (FDA). Efficacy can be defined as the ability of a dental material to function as was intended within the Oral cavity.