Tooth 12 (FDI): maxillary right lateral incisor

The three numbers

Careful with plain numbers: Universal 12 is a different tooth, the maxillary left first premolar (FDI 24).

About this tooth

Name

Maxillary right lateral incisor

Set

Adult (permanent)

Position

Upper arch, patient right (upper right, quadrant 1)

Erupts

8 to 9 years

Roots

1

Root canals

1

Crown surfaces

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

Also written

#7 (Universal), 1.2 (FDI with a dot), upper right 2

Read on 23 October 2026. Sources: American Dental Association, Tooth development charts (primary and permanent); Number of roots and canals, from Ingle's Endodontics; 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: 11 (maxillary right central incisor)
• Toward the back: 13 (maxillary right canine)
• Across the midline: 22 (maxillary left lateral incisor)
• In the other arch: 42 (mandibular right lateral incisor)

Convert any other tooth with the full chart.