Lower left first premolar

Dens premolaris

SkeletalSkeletonHeadLeft side

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What it is
Transitional tooth with two cusps (buccal and lingual) on its biting surface and a single root. The crown is covered with enamel, the hardest substance in the body.
Function
Holds and crushes food.
Size
Crown ≈ 7.0 × 7.7 mm, 8.5 mm tall; root ≈ 14 mm
Clinical note
First premolars are the teeth most often extracted to make space in orthodontics.

Nearby skeletal structures Lower left canine, Lower left central incisor, Lower left first molar, Lower left lateral incisor, Lower left second premolar, Lower right central incisor, Upper left first molar, Upper left first premolar, Upper left lateral incisor, Upper left second premolar