The dentist pulls out a numbing needle to give the man a shot.
"No way! No needles. I hate needles" the patient said.
The dentist starts to hook up the nitrous oxide and the man objects.
"I can't do the gas thing. The thought of having the gas mask on suffocates me!"

The dentist then asks the patient if he has any objection to taking a pill.
"No objection," the patient says. "'I'm fine with pills."
The dentist then returns and says, "Here's a Viagra."
The patient says, "Wow! I didn't know Viagra worked as a pain killer!"
"It doesn't" said the dentist, "but it's going to give you something to hold
on to when I pull your tooth."

I told this one to my dentist a few months ago at an appointment. She's a cute little blond thing, with a great sense of humor. Her and her assistant laughed their heads off. I heard her telling the others as I was leaving.

Reminds me of the one about the girl whose conks out in the desert + this Indian on horseback comes by + says he will give her a lift into town to the service station. So she climbs behind him, reaches around + grabs the saddle horn, + he takes off, bouncing across the prairie, all the time, yelling Yahoo! Yahoo! When she gets to the service station, she asks the attendant what that was all about. He looks at her + say's, "Lady, Indians don't use saddles."