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An artificial covering for a tooth that replaces most of the natural crown. Crowns can improve the appearance of badly discoloured or misshapen teeth, support teeth that cannot be adequately restored with fillings, relieve sensitivity from cracked teeth, and strengthen weak teeth. Treatment involves tooth preparation, impressions and a temporary crown at the first visit, followed by permanent cementing of the finished crown at a second visit. Tooth preparation can take up to 90 minutes, depending on the tooth and complexity. Possible complications include tooth breakage, pain or discomfort after preparation, a dying nerve, a loose crown and allergic responses.