INBDE (Integrated National Board Dental Examination) 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 1180

What percentage of mandibular 1st premolars have a 2nd canal?

20%

30%

The percentage of mandibular 1st premolars that have a second canal varies, but it is generally accepted that approximately 30% of these teeth have a second canal. This means that the options A, C, and D are incorrect as they either underestimate or overestimate the percentage of mandibular 1st premolars with a second canal. It is important for dental professionals to be aware of this second canal in order to properly diagnose and treat any potential tooth-related issues.

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40%

50%

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