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Even when brushing daily, your teeth can still appear yellow due to factors beyond basic oral hygiene. Understanding these reasons can help you address the underlying causes effectively.

Here are the most common explanations:

• Diet:
  Certain foods and drinks, like coffee, tea, red wine, and berries, contain pigments that can stain tooth surfaces. These stains build up over time, even with regular brushing, because toothbrush bristles may not remove deeply embedded pigments.
• Tooth enamel:
  The outer layer of teeth, called enamel, can wear down over time. When enamel thins, the yellowish dentin underneath becomes more visible. This is a natural process that brushing cannot reverse.
• Genetics:
  Some individuals’ genetics cause them to have thinner enamel or slightly darker dentin naturally. This means their teeth may appear yellowish even with proper brushing habits.
• Plaque and tartar buildup:
  Plaque hardens into tartar when not completely removed through brushing and flossing. Tartar is yellow or brown and can’t be cleaned away with a toothbrush, requiring professional cleaning.
• Smoking:
  Tobacco contains tar and nicotine, which stain teeth. These substances create a yellow or brown layer that brushing alone cannot eliminate.
• Ageing:
  Enamel naturally wears down as people age, making teeth look darker or yellower. This process is gradual, and brushing cannot completely prevent it.

Understanding these factors helps identify whether lifestyle changes, professional cleaning, or whitening methods enhance the appearance of your teeth.