Tooth 75 (FDI): mandibular left primary second molar

The three numbers

About this tooth

Name

Mandibular left primary second molar

Set

Baby (primary)

Position

Lower arch, patient left (lower left, quadrant 7)

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 K (Universal), 7.5 (FDI with a dot), lower left 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

Teeth next to it

• Toward the middle: 74 (mandibular left primary first molar)
• Across the midline: 85 (mandibular right primary second molar)
• In the other arch: 65 (maxillary left primary second molar)

Convert any other tooth with the full chart.