6) Seeds and nuts:

The rough surfaces of seeds and nuts give them abrasive effects. Sunflower seeds, almonds, walnuts, and cashews are good choices to pick the next time you’re at the grocer, as the chewing of these foods can aid in the brushing off of particles on our teeth.

Just imagine the scrubbing effect of a rough almond surface – it’s that effective. In other words, seeds and nuts act as a kind of exfoliator for our teeth.