Getting a grip

A man goes to his dentist have a tooth extracted.
The dentist pulls out a freezing needle to give the him a shot.
"No way! No needles, I hate needles! the man says.
The dentist starts to hook up the laughing gas and once again, the man objects.
"I can't do the gas thing. The thought of having the gas mask on is suffocating me!"
The dentist then asks the man if he has any objection to taking a pill.
"No objection, I'm fine with pills." the man says.
The dentist then returns and says, "Here's a Viagra tablet.
"The man says, "Wow! I didn't know Viagra worked as a pain killer!"
"It doesn't! says the dentist. But it''ll give you something to hold onto when I pull your tooth.