A spell which causes teeth to grow at an alarming rate.

Densaugeo was the incantation of a hex which caused the teeth to elongate at an alarming rate.

During the 1988–1989 school year at Hogwarts School of Witchcraft and Wizardry, this hex was taught to fifth year Defence Against the Dark Arts students by the then Professor of the subject Patricia Rakepick.

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

In September 2020, an adult Draco Malfoy used this hex again at Harry Potter during his duel with him in Harry's house, although Harry missed being hit by the spell.