Densaugeo is a hex used to grow teeth to a large size. Hermione was hit by this hex during a duel between Draco and Harry.
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It made her teeth grow rapidly and very long.
No, Hermione Granger had very large front teeth until she was fifteen. She tried to convince her parents to let her shrink them but, being dentists she was not allowed.She eventually got them shrunk when in her fourth year, when she was fifteen*, Draco Malfoy cursed her (although he was aiming for Harry) and made her teeth grow very large. When Madam Pomfrey was shrinking them she let her carry on for a little longer.*Hermione was born on the 19th September 1979 which meant she turned fifteen just after starting her fourth year unlike Harry Potter and Ron Weasley who were still fourteen.
While attempting to fix the crooked teeth of a woman, he cast the wrong spell and caused her to grow tusks. He was then taken into custody and sentenced to execution for his crime. However, the axe was blunt and it took forty-five hacks to kill him - even then his head wasn't completely severed.
Yes,You do grow when you are awake.
Many, one of them is ignorance: he had known from the very beginning that Tom Riddle is dark and may grow evil, but he didn't do anything to prevent it. Also, he let the Marauders bully Snape, just like he let Snape bully Harry and Neville later.