Some foods can help: crispy apples and celery slightly polish surfaces; while not a substitute for whitening

https://telegra.ph/Can-You-Whiten-Teeth-with-Braces-A-Guide-to-Timing-04-16

Some foods can assist: crunchy apples and celery mildly polish surfaces; while not a substitute for whitening, they support a cleaner, brighter-looking smile.