In cases where there has been decay in the tooth under the crown this decay leads to destruction of tooth structure and may affect its shape. As a result, the crown no longer fits and can become loose and needs to be replaced. If the teeth have shifted significantly the same crown cannot be reused. In your case it is important to consult a dentist and get the crown seen and then determine whether it can be reused or not. Do keep us posted.
Best luck and kind regards!
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