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[[../..Muggles' Guide to Harry Potter/Characters/Draco Malfoy|Draco Malfoy]] used it first in [[../..Muggles' Guide to Harry Potter/Books/Goblet of Fire/Chapter 18|Harry Potter and the Goblet of Fire]]; he had goaded [[../..Muggles' Guide to Harry Potter/Characters/Harry Potter|Harry]] into duelling with him. The spell hit Harry's[[..Muggles' Guide to Harry Potter/Magic/Furnunculus/]] jinx and ricocheted, hitting [[../..Muggles' Guide to Harry Potter/Characters/Hermione Granger|Hermione]] in the mouth. As a result of this, Hermione's front teeth grew to a length of over a foot long.
== Analysis ==
In [[../..Muggles' Guide to Harry Potter/Books/Order of the Phoenix|Harry Potter and the Order of the Phoenix]], we learn that combining jinxes can have unexpected effects. We can't be certain that the extreme growth of teeth was the intended effect; the spell may well have been modified by hitting the Furnunculus spell. Additionally, as this spell does not seem to be used elsewhere, it is hard to know what its normal effect would be. We can't even really tell whether the spell would cause growth of whatever it hit, or is specific to teeth; the word used seems to be related to teeth ("dens" from the French "dents", "augeo" from the same root as "augment"), but without another example of the spell in action, this must be purest speculation.
Given the apparent effect of this spell, it is hard to imagine what Draco's intent would be in casting it; the effect would seem more likely to enrage the victim, rather than incapacitate him, although one supposes that the lisp resulting from having teeth overlapping one's chin could render verbal spell-casting ineffective.
