What happens if you can't afford to pay a bill at the time of service?

Lately I've been scheduling a lot of appointments, dentist appointments, vet appointments, etc. I've noticed that almost all offices have a disclaimer that payment is due at the time of service. Now, obviously I intend to pay my bills right there. But I'm curious what would happen if someone... show more Lately I've been scheduling a lot of appointments, dentist appointments, vet appointments, etc. I've noticed that almost all offices have a disclaimer that payment is due at the time of service.

Now, obviously I intend to pay my bills right there. But I'm curious what would happen if someone didn't? Say an appointment ended up being more expensive than they were originally quoted or something.
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