Also known as Dental Cap is a sort of dental restoration which covers the whole crown part of a tooth or an implant. It is the treatment of choice if big part of tooth is destroyed by decay or is broken for any reason like trauma. The main reason we crown a tooth is to protect the remaining parts and keep everything together under the crown to prevent any future damage due to breaking or chipping. Note that even a tooth is crowned still there is a chance that the tooth itself decays and cause future problems. Normally nothing happens to crown itself but it is the tooth underneath which decays due to bad oral hygiene and usually the treatment would be replacing the crown.