stain

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Related to intrinsic stain: extrinsic stain
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Intrinsic stains are related to enamel and dentin properties, whereas extrinsic stains are associated to deposition of either food or beverage stains on the tooth surface, poor tooth brushing techniques, smoking, dietary intake of tannin-rich foods, excess use of Chlorhexidine mouth wash, and/or consumption of metal salts (15,16).
Professional whitening targets intrinsic stains that cannot be removed during thorough mechanical scaling and polishing and include stains related to age, trauma, certain medications and chromogenic foodstuffs.