Tooth 64 (FDI): maxillary left primary first molar

The three numbers

About this tooth

Name

Maxillary left primary first molar

Set

Baby (primary)

Position

Upper arch, patient left (upper left, quadrant 6)

Erupts

13 to 19 months

Sheds

9 to 11 years

Roots

3

Crown surfaces

Mesial, distal, buccal, palatal (lingual) and occlusal.

Also written

Letter I (Universal), 6.4 (FDI with a dot), upper left D

Read on 23 October 2026. Sources: American Dental Association, Tooth development charts (primary and permanent); Kim and others, Root and Canal Morphology of Maxillary Primary Molar using CBCT and 3D CT, Journal of the Korean Academy of Pediatric Dentistry 2021; 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: 63 (maxillary left primary canine)
• Toward the back: 65 (maxillary left primary second molar)
• Across the midline: 54 (maxillary right primary first molar)
• In the other arch: 74 (mandibular left primary first molar)

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