I'm a Moth

A guy walks into a dentist's office and says, "I think I'm a moth."
The dentist replies "You shouldn't be here. You should be seeing a psychiatrist..." The guys replies, "I am seeing a psychiatrist." The dentist says, "Well then what are you doing here?" And the guy says, "Your light was on."

Yes or No

Dr. Dave's Dental-Chair Discovery: Dentists are incapable of asking questions that require a simple yes or no answer.

Dentist

Q: Why don't dentists display their awards?
A: Because they want to prevent plaque build-up.