Why Are They Called Canine Teeth? Etymology and Function

Etymology

"Canine" derives from Latin caninus ("of the dog"), from canis (dog). The name reflects their prominent, fang-like appearance in carnivores—especially dogs and wolves—where they are essential for seizing and tearing prey.

Human Canine Teeth

• Position: Two maxillary (upper), two mandibular (lower); lateral to lateral incisors.
• Morphology: Single cusp, longest root of any tooth, convex labial surface.
• Eruption: Primary canines 16–22 months; permanent maxillary ~11–12 yr, mandibular ~9–10 yr.

Functions in Humans

• Guiding occlusion: Canine guidance (lateral excursions) protects posterior teeth from lateral forces.
• Tearing food: Assist incisors in gripping and shearing.
• Speech: Support labiodental sounds (/f/, /v/).
• Aesthetics: Cornerstone of smile arch; support lip contour.

Clinical Significance

• Commonly impacted (especially maxillary); may require surgical exposure + orthodontics.
• Key in orthodontic planning (Class I canine relationship = ideal).
• Root resorption risk if adjacent to impacted tooth.

Though we no longer hunt with them, canines remain critical for occlusion, function, and facial harmony.