I still recall our elementary school in India requiring that our nails be trim and clean, hair neatly tied in white ribbons and shoes polished to a gleam. We would have daily inspections. In dental college I learned how oral health affected our overall well-being and how much more important oral hygiene screening would have been, especially when compared to well-polished shoes!
Dental care is expensive. That's not a big problem for the affluent, most of whom have dental benefits anyway. But, it's a very big deal for the less well off. As a consequence, many if not most people without dental benefits forego preventive and routine care. And a lot of them wind up in hospital emergency rooms when pain caused by diseased teeth and gums becomes unbearable.