|"Are you a wizard or not?"
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This spell (incantation unknown) was a charm used to straighten crooked teeth. Sir Nicholas de Mimsy-Porpington attempted to use this spell on Lady Grieve at her request, but failed and gave her a tusk instead. He was executed the following morning. After he returned as a ghost, Nearly-Headless Nick recounted the incident in a ballad.
- J. K. Rowling's official site (First mentioned)