A guy and a girl meet at a bar. They get along so well that they decide to go to the girl's place. A few drinks later, the guy takes off his shirt and then washes his hands. He then takes off his

A guy and a girl meet at a bar. They get along so well that they decide to go to the girl's place. A few drinks later, the guy takes off his shirt and then washes his hands.

He then takes off his pants and—again—washes his hands.

The girl watches him carefully and says, "You must be a dentist."

The guy, surprised, says, "Wow! How did you know?"

"Easy," she replies. "You keep washing your hands."

They continue their drinks, and soon, one thing leads to another. As things heat up, the girl stops him and says, "Wait a minute! You’re a really good dentist, right?"

He smiles proudly. "Yep! A great one!"

She sighs with relief. "Good… because I haven’t been flossing!"