According to Consumer Guide to Dentistry, one advantage of getting a gold tooth cap, also called a gold crown, is the stronger material to support what remains of the tooth, especially in cases of grinding, clenching or heavy-duty bites. Gold crowns last longer and take less preparation work. Gold crowns are also less rough than the other cap materials, which means less wear and tear on teeth.
The Consumer Guide to Dentristry explains that while gold crowns can be unpopular for reasons having to do with appearance, the farther back in the mouth the crown is, the less visible it is. WebMD adds that with gold crowns, less of a tooth needs to be removed, and any chipping of the crown is rare. Wikipedia points out that various elements, including gold, platinum, palladium and silver, go into gold crowns. These four elements are noble metals, and the more of these four metals a gold crown contains, the higher its quality.
Other crown types, according to WebMD, are stainless steel, porcelain fused to metal, all resin and all ceramic. Regardless of the material from which they are made, functions of tooth caps include protecting weakened teeth, keeping a cracked tooth together and helping keep dental bridges in place.