Eating an apple creates an effect similar to a toothbrush because of the presence of fiber-rich flesh and skin. It has been observed that eating apples regularly helps remove plague and stains from the teeth.
Eating an apple also helps get rid of any food particle sticking to your gums and crevices of your teeth. In fact, apples and carrots are hailed as mini-toothbrushes because of the various cleansing effect they have on the teeth.