Canines — also called cuspids or, informally, “eye teeth” — are the four pointed teeth positioned at the corners of the dental arch, one in each quadrant, situated between the lateral incisors and the first premolars. Named for their resemblance to the teeth of carnivorous animals, they are among the most anatomically distinctive and functionally critical teeth in the human dentition.

Anatomy and Structure

Each canine has a single, prominent cusp that tapers to a well-defined cusp tip. Beneath the gumline, canines possess the longest root of any tooth in the mouth — a feature that anchors them deeply in the alveolar bone and contributes to their exceptional resistance to extraction and loss. The crown narrows from a broad cervical base to converging mesial and distal cusp ridges. The enamel layer is comparatively thick, reinforcing the crown against the repeated mechanical demands of tearing and cutting food.

Clinical Significance

Canines serve roles that make them indispensable in both function and treatment planning:

• Tearing and cutting food — Their pointed shape and deep root support allow canines to grip and shear fibrous or tough foods efficiently.
• Canine guidance — During lateral jaw movements (excursions), the canines contact and guide the mandible, shielding the posterior teeth — premolars and molars — from damaging lateral forces.
• Arch stability — Positioned at the arch corners, canines act as structural pillars that help distribute occlusal load across the full dental arch.
• Prosthetic abutments — Their long roots and dense surrounding bone make canines preferred anchor teeth for fixed bridges and removable partial dentures.
• Longevity — Canines are typically the last teeth to be lost in patients with periodontal disease, frequently outlasting adjacent teeth in compromised dentitions.

Eruption and Impaction

Mandibular canines typically erupt between ages 9 and 10, while maxillary canines — sometimes called eye teeth because their roots lie just beneath the orbital rims — emerge between ages 11 and 12. Maxillary canines rank among the most frequently impacted teeth, second only to third molars, and often require a combination of surgical exposure and orthodontic traction to achieve proper arch position.

Given their structural durability, occlusal guidance role, and prosthetic value, preserving healthy canines is a priority in both restorative and preventive dental care.