I've never had a female dentist in any sense of the word. But the dental assistants do seem to me to get evil enjoyment out of sticking that vacuum thing in my mouth while the dentist cleans or gives me a filling.
Putting it in, then taking it out. Then back in again. Sometimes trying to push it too far down the throat ...
The dentist does tell you to spit, but you can't help swallowing just a bit, can you?
TYWD