Earlier quoted context omitted.
The true problem you're identifying is poverty. Dental care isn't outrageously expensive. It doesn't have huge margins or vast inefficiency. The reason people can't afford it is because they're poor . No bureaucratic solution involving government-subsidized dental services is going to produce a better outcome than taking the same money and giving it to those people in cash.
The margins are healthy enough that many dentists work 4 days a week while earning a fantastic living.
What are you proposing, price controls? Then what do you do when your dentist quits to become a real estate broker?