"I don't know..." Harry shook his head. "That Gilderoy Lockhart is a fraud. Obliviate is the only spell he can actually use—he doesn't know anything about any other magic."
"That's such a pity!" Mr. Granger sighed. "If bone fragments could be removed without pain, the surgical procedure would surely be much simpler."
"Surgery..." Fred repeated. "Mr. Granger, you seem to be a doctor too, right? What exactly is this surgery you're talking about?"
"I'm curious too!" George picked up the thread. "Do you cut open someone's belly and drill holes in their bones? It sounds like Dark Magic used to torture people!"
"I'm a dentist..." Mr. Granger explained. "I drill holes in teeth. Hmm... from a certain perspective, I suppose that counts as working on bones too?"
"Oh!" Fred, George, Sirius Black, and the others exclaimed in unison.
"You can drill holes in teeth? Being a dentist is no simple profession!" Sirius Black said. "Wendell, it must be difficult to become a dentist, right?"
"Mr. Granger, may I ask something presumptuous?" Neville asked tentatively. "Why do you need to drill holes in teeth?"
Mr. Granger explained patiently, "Because if you don't take proper care of your teeth, you'll develop cavities and toothaches. If it gets serious, all you can do is pull them out and replace them with dentures."
Fred and George cried out dramatically, "That sounds terrifying!"
Ron and the others nodded as well, showing their agreement with that conclusion.
Mr. Granger was somewhat surprised by their reaction. "Don't you ever get toothaches or cavities? Do you usually take care of your teeth? Do you brush after eating..."
He raised a string of questions about dental care. Ron and the others mostly shook their heads, only nodding occasionally.
"Frank, this may be a bit presumptuous..." Realizing something, he looked