I'm sure there are. One of my mother's husbands — she had four, all cops — loved to tell the story about arresting a man outside of a Zippy Mart on Virginia Loop Road in Montgomery, AL.

The cashier called 911 and told them that a man had robbed the store. When he pulled up he found the man sitting on the curb just waiting for him. He had pulled a knife and stolen one pack of Big Red chewing gum from the store.

All because it was getting cold outside and he needed a place to sleep. And he also had a toothache that had been bothering him for weeks. So he hoped to see a doctor while he was in county jail.

Out of all the places to be incarcerated, county jails in the USA have a pretty poor record on healthcare. They are run by the counties, not the states, and therefore it is open season on how they provide the services. Most [1] just contract to the lowest bidder private provider. These providers' jobs are to dispense the lowest amount of healthcare to the lowest amount of patients in order to maximize profits. Mostly providing only emergency care to those who are in immediate risk of death. Many also require the prisoners to use the funds provided by their family (for phone calls, letters, clothing, food etc) to pay to even put a medical request into the system in the first place.

In terms of dental, most county jails will only do tooth pulls, not any other type of dental work. They will not try to save teeth at all.

[1] some larger areas like Cook County have their own healthcare systems and can be somewhat more sophisticated and less constrained by monetary concerns