"I don't know..." Harry shook his head. "That Gilderoy Lockhart is a fraud. All he can really do is the Obliviation Charm. He doesn't know a thing about any other magic."
"That really is a shame!" Mr. Granger sighed. "If bone fragments could be removed painlessly, the surgical procedure would definitely be much simpler."
"Surgery, huh..." Fred repeated. "Mr. Granger, you're a doctor too, aren't you? What exactly is this surgery you're talking about?"
"I'm curious too!" George picked up the thread. "Do you cut open the belly and drill holes in the bones? It sounds a lot like torturous Dark Magic!"
"I'm a dentist..." Mr. Granger explained. "I drill holes in teeth. Mm... from a certain point of view, I suppose that counts as working on bones?"
"Oh!" Fred, George, Sirius Black, and the others all exclaimed in unison.
"You can drill holes in teeth? Being a dentist really isn't simple!" Sirius Black said. "Wendell, it must be very hard to become a dentist, right?"
"Mr. Granger, may I ask something?" Neville asked tentatively. "Why do you drill holes in teeth?"
Mr. Granger explained patiently, "Because if you don't take good care of your teeth, problems like cavities and toothaches will appear. If it gets serious, the tooth can only be pulled out and replaced with dentures."
Fred and George cried in exaggerated voices, "That sounds terrifying!"
Ron and the others all nodded as well, showing their agreement with that conclusion.
Their reaction surprised Mr. Granger a little. "Don't you get toothaches or cavities? Do you usually pay attention to dental care? Do you brush your teeth after eating..."
He asked a whole string of details about dental care, and Ron's group basically all shook their heads, only occasionally nodding.
"Frank, this may be a little presumptuous..." Realizing something,