Discontinue use if you experience irritation of the gums, and this may be due to your gums being too abrasive. When they say an apple a day keeps the doctor away, they forgot to mention that it helps eliminate tooth whitening visits to the dentist, too.
One simple way to whiten your teeth is to eat crunchy foods like apples, carrots and pears.
This removes the sticky residue left by candy, soft baked goods and other sugars.

Apples in particular are good because they also contain malic acid, a compound in teeth whitening products.
Other crunchy foods improve your teeth by scraping away plaque and increasing saliva production.
Strawberries reportedly whiten your teeth, despite their red color. Chocolate purportedly has antibacterial effects, so chocolate dipped strawberries theoretically will help clean your teeth.

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