INBDE (Integrated National Board Dental Examination) Practice Exam

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Black thin lines on the cervical third are from consumption of?

  1. Sugar

  2. Iron

  3. Tea

  4. Coffee

The correct answer is: Iron

Consumption of iron can lead to black thin lines on the cervical third of the teeth. These lines are known as iron stain or siderotic stain. Iron supplements or other sources of excess iron can result in this type of staining on the teeth. Options A, C, and D are not associated with the development of black thin lines on the cervical third of the teeth.

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