INBDE (Integrated National Board Dental Examination) Practice Exam

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How many canals does a mandibular first molar usually have?

  1. 2

  2. 3

  3. 4

  4. 5

The correct answer is: 3

Most mandibular first molars usually have three canals, which are described as the mesiobuccal, distobuccal, and palatal canals. Option A is incorrect because although some mandibular first molars can have two canals, it is not the most common. Option C is incorrect because four canals are rare in mandibular first molars. Option D is incorrect because five canals are extremely rare in mandibular first molars. Therefore, option B is the most likely and accurate answer.

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