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Which tooth is number 17?

In the Universal Numbering System, tooth 17 is the lower left third molar (mandibular left third molar). Its FDI (ISO 3950) designation is 38 and its Palmer designation is 8 in the lower left quadrant. It is a molar in the lower arch with typically 2 roots.

Last verified
2026-07-08
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Query patterns

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  • Which tooth is Palmer 8 Lower Left?
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  • Universal 17 FDI 38 Palmer 8
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  • lower left third molar
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Source citations

  • TOOTH-1 American Dental Association — Universal Numbering System (ada.org)
  • TOOTH-2 ISO 3950:2016 — Dentistry, designation system for teeth and areas of the oral cavity (FDI two-digit) (iso.org)
  • TOOTH-3 FDI World Dental Federation — two-digit notation (fdiworlddental.org)

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