"Worried your kid isn't brushing his or her teeth properly? You might want to try the Oreo test."
https://www.webmd.com/oral-health/news/20220201/the-oreo-test-and-other-ways-to-help-kids-oral-health
https://www.webmd.com/oral-health/news/20220201/the-oreo-test-and-other-ways-to-help-kids-oral-health