Even if you brush, floss and see the dentist regularly, you can still have tooth discoloration (i.e. yellow teeth). Other factors like age, smoking and certain foods/beverages(i.e. Soda, coffee) can lessen the whiteness of your teeth. Nowadays, people have access to several options including over-the-counter whitening products from toothpaste companies like Crest and Colgate, but getting your teeth professionally whitened by a dentist is always going to be the best choice for long-lasting results and whiter teeth. 

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