有大学的，有健康网站，有牙膏厂商，所有的都说应该等。

https://www.cuimc.columbia.edu/news/brushing-immediately-after-meals-you-may-want-wait

https://www.healthline.com/health/should-you-brush-your-teeth-before-or-after-breakfast

https://www.colgate.com/en-ca/oral-health/brushing-and-flossing/is-brushing-teeth-after-eating-good-for-you

这篇特别指出午餐，如果是甜食那应该马上刷牙，如果是酸食比如水果果汁应该等。

https://centennialsmiles.ca/should-you-brush-your-teeth-after-lunch/