Densaugeo

"It wasn't a pretty sight. Hermione's front teeth — already larger than average — were now growing at an alarming rate; she was looking more and more like a beaver as they elongated, past her bottom lip, towards her chin — panic-stricken, she felt them, and let out a terrified cry."

- Description

Densaugeo is a hex which causes the teeth to elongate at a grotesque, alarming rate. The Shrinking Charm can be used to counteract this spell.

History
Hermione Granger was hit by this spell from Draco Malfoy's wand. Draco and Harry had begun fighting in the corridor, which eventually led to a duel, but the hexes they cast at each other missed and hit Hermione and Gregory Goyle.

Known practicioners

 * Draco Malfoy

Etymology
The incantation is derived from Latin "dens", which means "tooth", and "augeo", which translates to "increase" or "grow".

Behind the scenes

 * The hex is included in the "5 Spell Pack" DLC for LEGO Harry Potter: Years 5-7. In the game, the hex not only enlarges teeth, it also makes the victim wear groucho glasses.

Appearances

 * Harry Potter and the Goblet of Fire
 * LEGO Harry Potter: Years 5-7
 * Pottermore