The UK has dentists? I kid because, well, you know.
In US prisons, a dental hygienist can clean teeth with just a prison guard present. But Frankie is becoming a Dental Assistant, they need to work with a dentist in the area. Of course, a dentist could be working on another patient in a nearby chair. It's also never a good idea for staff to discuss family details with inmates - but it does seem like a Frankie thing to do.
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