Physiology & Biochemistry · single question
Which substance from a baby pacifier causes tooth staining?
Show answer and explanation
Correct answer: A. Bismuth compounds
Bismuth compounds can react with hydrogen sulfide to form bismuth sulfide, causing dark staining on tooth surfaces.
- A. ✅ CORRECT – Bismuth compounds cause dark (brown/black) tooth staining.
- B. ❌ Latex rubber doesn't stain teeth.
- C. ❌ BPA plastic doesn't cause tooth staining.
- D. ❌ Iron supplementation causes staining but is not associated with pacifiers.
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