Earlier quoted context omitted.
Dentists in the US* flossing basically doesn’t exist in other parts of the world
Countries where "flossing doesn't exist" are probably places where people have poor oral health and jacked up teeth. I would argue that flossing is even more important than brushing teeth, since the food particles stuck between teeth are more likely to stick around and feed the bacteria that cause cavities and bad breath.
Said someone who probably never travelled in Europe