Why do I now need a crown and not just a filling

Very large fillings are likely to be weak, unstable and to leak over time leading to recurrent decay and replacement with even larger fillings. This process of patching or replacing already large fillings is what we call "patchwork dentistry". In most situations, patchwork dentistry ultimately leads to the loss of the tooth, or at minimum to very expensive methods of repair. A crown can strengthen a weakened tooth and help to give it the best long term strength and prognosis.
 

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