DENSAUGEO
This spell, when performed correctly, enlarges teeth. It was discovered by accident when wizards were working on a spell to increase courage. The spell was supposed to be "fidensaugeo," which increases courage, but when a wizard practiced it on a fellow wizard, he forgot to use the 'fi' prefix, and to everyone's surprise, the wizard's teeth rapidly started increasing. Immediately after the unfortunate accident, the wizards furiously experimented to find a teeth-reduction spell
(densredeo).
"dens" -- Latin for 'tooth'
"augeo" -- from Latin verb augere, meaning 'to increase' or 'enlarge'
Book: Goblet of Fire
