Some foods can help: crunchy apples and celery slightly polish surface areas; while not an alternative to whitening
https://www.mediafire.com/file/bkq250x6aqlwhev/pdf-69142-56044.pdf/file
Some foods can assist: crunchy apples and celery mildly polish surfaces; while not a substitute for whitening, they support a cleaner, brighter-looking smile.