The Hair-Thickening Charm[1] (incantation unknown) was a charm which caused the target's hair to grow longer and thicker very quickly.


Harry Potter might have unknowingly used this spell as a child to re-grow his hair after Petunia Dursley had cut it too short.[2]

In 1995, Miles Bletchley was said to have cast a jinx on Alicia Spinnet from behind while she was doing homework in the Hogwarts library in 1995. His spell, one of several incidents in which Slytherins jinxed members of the Gryffindor Quidditch team, caused Alicia's eyebrows to grow at an alarming rate. By the time Alicia reached the Hospital Wing, they were blocking both her eyes and her mouth. Professor Snape would not accept the testimony of the fourteen eyewitnesses who saw Miles jinx Alicia, insisting instead that Alicia must have performed a Hair-Thickening Charm on herself, presumably in a botched attempt to gain a fuller head of hair.[1]

Behind the scenes

  • This may be one of the hair-regrowing spells mentioned by Miranda Goshawk in her Book of Spells.
  • There may exist a separate Jinx with nearly identical effects based on the testimony of the fourteen eyewitnesses who said they saw Miles cast the spell on Alicia, or it may have just been a malicious use of this charm.


Notes and references

  1. 1.0 1.1 1.2 1.3 Harry Potter and the Order of the Phoenix, Chapter 19 (The Lion and the Serpent)
  2. Harry Potter and the Philosopher's Stone, Chapter 2 (The Vanishing Glass)
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