Another Visit to Dentist

A lady walks into the dentist's office, takes off her underwear, sits 
down on the chair and spreads her legs wide open. 
"You must have made a mistake " says the shocked dentist,"The gynecologist's office is one level higher. "
 
To that the lady replies, "No mistake, you installed my husband's dentures last week, now you'll be the one getting them out. "