"Tired of your teeth looking yellowed and dull, but not sure what’s making them that way? We made you a list of some of the worst teeth-staining foods that make it difficult to maintain a pearly-white smile. And, because we all like to indulge once in a while, we included a few stain-fighting foods that help ward off unwanted discoloration."
https://www.colgate.com/en-us/oral-health/teeth-whitening/discolored-teeth-five-foods-that-cause-stains
https://www.colgate.com/en-us/oral-health/teeth-whitening/discolored-teeth-five-foods-that-cause-stains
