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Endodontics · single question

What percentage of mandibular first premolars have TWO canals?

  1. 40%
  2. 26%
  3. 15%
  4. 60%
Show answer and explanation

Correct answer: B. 26%

Approximately 26% of mandibular first premolars have two canals, making them clinically challenging. This tooth is notorious for bifurcating, often with a buccal and lingual canal. The majority (~74%) have one canal. 40% and 60% are incorrect. Knowing this helps avoid missed canals during RCT.

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