Some foods can help: crunchy apples and celery slightly polish surfaces; while not an alternative to whitening
https://www.mediafire.com/file/0hekbvwv7w56s2a/pdf-14981-99239.pdf/file
Some foods can help: crispy apples and celery mildly polish surfaces; while not a substitute for whitening, they support a cleaner, brighter-looking smile.