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A custom-made porcelain or ceramic cover fitted entirely over a compromised tooth. It restores the tooth's natural shape, size, colour and structural strength. Dental crowns can protect severely weakened teeth, including teeth that have had root canal therapy or do not have enough healthy enamel to support a standard filling. They may help restore comfortable chewing, hold fractured or cracked teeth together, improve appearance, alignment and colour, and provide a durable alternative to repeated large fillings.