INBDE (Integrated National Board Dental Examination) Practice Exam 2026 - Free Practice Questions and Study Guide

Question: 1 / 1180

What causes yellow brown stains on teeth?

P. intermedia

Chromogenic bacteria

S. mutans

Chlorhexidine and stannous fluoride

Yellow-brown stains on teeth are often caused by the use of chlorhexidine and stannous fluoride. Chlorhexidine mouthwash, commonly used for its antimicrobial properties in controlling plaque and gingivitis, can lead to extrinsic staining on teeth, especially when used for prolonged periods or not used as directed. Stannous fluoride, another common component in toothpaste known for its anti-cavity and anti-bacterial properties, can also contribute to staining if not used correctly. Therefore, the correct answer is D, Chlorhexidine and stannous fluoride.

Options A, B, and C are incorrect because P. intermedia, chromogenic bacteria, and S. mutans are not typically associated with causing yellow-brown stains on teeth.

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