Final answer:
Tooth staining is commonly caused by food pigments due to poor oral hygiene.
Explanation:
Tooth staining is usually caused by food pigments. It can be seen as darker deposits on the crowns of teeth, as shown in Figure 24.2.2 and 24.8. Staining is often a result of inadequate dental hygiene and can lead to various dental issues like tartar, decay, and gingivitis.
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