Apples have been called nature’s toothbrush because they stimulate the gums, increase saliva flow and reduce the build-up of cavity-causing bacteria. Their rough, fiber-rich flesh, makes them the ideal food for cleansing and brightening teeth. Chewing also stimulates the saliva flow, which washes away food particles.
Apples can actually help scrub away stubborn stains over time. Their cleansing effect on your teeth may be noticeable—if ever so slightly—especially if you’re a coffee drinker. Start eating an apple a day as a between-meal snack and see if you notice a difference! Be sure to follow it with a glass of water to rinse away the sugar, acid, and any plaque it may have removed from your enamel.
(Source: Prevention Magazine)