It can't: A crown is a durable covering made of porcelain or metal placed over a tooth to strengthen the tooth due to decay, fracture, breakage, etc. There has to be a usable amount of tooth for the crown to be adhered to. The edge or margin can be placed just below the gum line but a crown cannot sit on just gums. Crowns are cemented or bonded to the existing tooth.
Answered 10/28/2017
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