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Tinker's dam. A tinker's dam is a temporary patch to repair a hole in a metal vessel such as a pot or a pan. It was used by tinkers and was usually made of mud or clay, or sometimes other materials at hand, such as wet paper. The material was built up around the outside of the hole, so as to plug it.
A dental dam, like a condom, is a barrier method. It is a thin, square piece of rubber which is placed over the labia or anus during oral-vaginal or oral-anal intercourse. Dental dams are most often made of thin latex rubber; however, for those allergic to latex, they are also available in silicone. Although specially-made rubber dental dams are sold in stores, plastic saran wrap from your kitchen can serve as an effective dental dam as well.