I suppose this could be a joke about a dentist. Unfortunately they are a rather difficult bunch to joke about.
As usual, it ends up being about something else.
A man phones a dental clinic to inquire about the price of removing a tooth
“Hello. How much is it to get a tooth removed”, asks the man
“That’ll be $700, it includes anesthetic, tooth extraction by myself, and assistance from a nurse”, replies the dentist
“That’s a bit much for me, how much if the nurse extracts it?”
“Well I guess we could do that, it might not be as painless if I did it, but we’ll do that for $500”
“Hmmm…”, thinks the man. “Still a bit high, what if we didn’t have any anesthetic?”
“That would be highly unusual and very painful, but I could do that for $300”, explains the dentist
“I don’t know, I’m not made of money. Could your receptionist tie a string around the tooth and yank it as hard as they can, how much for that?”
“This is extremely uncommon, but I suppose we could that for $100”
“Great!”, the man says excitedly. “I’ll book an appointment for my wife for next Tuesday please”.