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Endodontics · single question

Which tooth/root has one of the LOWEST reported incidences of containing two canals?

  1. The mandibular first premolar
  2. The mandibular second premolar (reported around 3-4% incidence of a second canal in several studies)
  3. The maxillary first premolar
  4. A mandibular canine
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Correct answer: B. The mandibular second premolar (reported around 3-4% incidence of a second canal in several studies)

While the mandibular first premolar itself has a meaningfully variable (and sometimes clinically underestimated) rate of a second canal, several anatomic studies report the mandibular second premolar as having one of the lowest rates of a second canal (roughly 3-4% in some series) among commonly tested teeth — though exact figures vary by population and imaging method studied.

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