This restoration is a complete covering of a tooth. If the crown is done with the best materials, it should last a lifetime, ideally. Many factors, of course, are involved. The material which lasts the best in the mouth is gold. Therefore, a crown which has gold meeting the tooth underneath is usually the best choice. Of course, nowadays, the gold can be hidden so that it is not noticed. Beware of a crown costing much less than usual. It is better to make one great crown, which lasts forever, than a "bargain" crown, which may need to be replaced in a few years.