Tooth 35 (FDI): mandibular left second premolar

The three numbers

About this tooth

Name

Mandibular left second premolar

Set

Adult (permanent)

Position

Lower arch, patient left (lower left, quadrant 3)

Erupts

11 to 12 years

Roots

1

Root canals

1

Crown surfaces

Mesial, distal, buccal, lingual and occlusal.

Also written

#20 (Universal), 3.5 (FDI with a dot), lower left 5, second bicuspid

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: 34 (mandibular left first premolar)
• Toward the back: 36 (mandibular left first molar)
• Across the midline: 45 (mandibular right second premolar)
• In the other arch: 25 (maxillary left second premolar)

Convert any other tooth with the full chart.