Teeth can become stained by bacterial pigments, food-goods and vegetables rich with carotenoids orxanthonoids. Certain antibacterial medications (like tetracycline) can cause teeth stains or a reduction in the brilliance of the enamel.
Ingesting colored liquids like coffee, tea, and red wine can discolor teeth.
According to the American Dental Association, different whitening methods include in-office bleaching, which is applied by a professional dentist at-home bleaching, which is used at home by the patient The whitening shade guides are used to measure tooth color.
These shades determine the effectiveness of the whitening procedure, which may vary from two to seven shades. The effects of bleaching can last for several months, but may vary depending on the lifestyle of the patient.
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