Tooth 72 (FDI): mandibular left primary lateral incisor

The three numbers

About this tooth

Name

Mandibular left primary lateral incisor

Set

Baby (primary)

Position

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

Erupts

10 to 16 months

Sheds

7 to 8 years

Crown surfaces

Mesial, distal, labial (facial), lingual and incisal.

Also written

Letter N (Universal), 7.2 (FDI with a dot), lower left B

Read on 23 October 2026. Sources: American Dental Association, Tooth development charts (primary and permanent); 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: 71 (mandibular left primary central incisor)
• Toward the back: 73 (mandibular left primary canine)
• Across the midline: 82 (mandibular right primary lateral incisor)
• In the other arch: 62 (maxillary left primary lateral incisor)

Convert any other tooth with the full chart.