Stainless steel crowns are used to restore back teeth that are too badly decayed to hold fillings. When tooth decay on back teeth has been left untreated, teeth may have extensive damage to the enamel, dentin and sometimes the nerve (pulp). In such cases, fillings are not a viable option, and stainless steel crowns necessary. These prefabricated silver-colored crowns are fit; then cemented onto the primary (baby) teeth to prevent further damage until these teeth are naturally lost.