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Causes its victim's toenails to grow alarmingly fast
- "Harry had already attempted a few of the Prince's self-invented spells. There had been a hex that caused toenails to grow alarmingly fast [...] "
The Toenail-growing hex (incantation unknown) is used to cause the victim's toenails to grow at an alarmingly fast rate.
- " [...] he had tried this on Crabbe in the corridor, with very entertaining results."
- Harry Potter and the Half-Blood Prince (First appearance)