Tooth 85 (FDI): mandibular right primary second molar

Quick answer

Tooth 85 in FDI is Universal T and Palmer LRE: the mandibular right primary second molar.

The three numbers

Mandibular right primary second molar in each system
System	Number
FDI	85
Universal	T
Palmer	LRE

About this tooth

Name: Mandibular right primary second molar
Set: Baby (primary)
Position: Lower arch, patient right (lower right, quadrant 8)
Erupts: 23 to 31 months
Sheds: 10 to 12 years
Roots: 2
Root canals: 3 or 4
Crown surfaces: Mesial, distal, buccal, lingual and occlusal.
Also written: Letter T (Universal), 8.5 (FDI with a dot), lower right E

Read on 23 October 2026. Sources: American Dental Association, Tooth development charts (primary and permanent); Salama and others, Anatomy of primary incisor and molar root canals, Pediatric Dentistry 1992; Dental anatomy, citing Ash and Nelson, Wheeler's Dental Anatomy, Physiology and Occlusion. Ages and counts are usual figures, and teeth vary from person to person.

On the chart

Tooth 85 marked on the chart, with its side view.

Teeth next to it

Convert any other tooth with the full chart.

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