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Which baby tooth is letter K?

In the Universal Numbering System, primary tooth K is the primary lower left second molar (primary mandibular left second molar). Its FDI (ISO 3950) designation is 75 and its Palmer designation is E 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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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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