What effect did the densaugeo spell have on Hermoine Granger?

The spell "Densaugeo" was not used on Hermione Granger in the Harry Potter series. The spell was used by Draco Malfoy on Neville Longbottom in "Harry Potter and the Chamber of Secrets" to make his teeth grow abnormally large.

It's possible you're thinking of a different spell or a fan fiction scenario.