Almost all cultures have some mechanism of cleaning larger food particles between teeth, particularly back teeth. But, more to the point -- absence of evidence

Almost all cultures have some mechanism of cleaning larger food particles between teeth, particularly back teeth. But, more to the point -- absence of evidence is not evidence of absence: https://www.health.harvard.edu/blog/tossing-flossing-2016081710196 https://www.health.harvard.edu/blog/tossing-flossing-2016081...