## **Core Concept**
Tooth development, also known as odontogenesis, involves the formation of teeth through a series of complex processes. The development of teeth can be divided into several stages: initiation, proliferation, histodifferentiation, and morphodifferentiation. The completion of crown formation, or crown completion, is a critical milestone in tooth development.

## **Why the Correct Answer is Right**
The maxillary canine, also known as the maxillary cuspid, is one of the teeth in the human mouth. The development of teeth, including the maxillary canine, follows a somewhat predictable timeline. Generally, the crown of the maxillary canine completes its formation around 4-5 years of age. This process involves the differentiation of ameloblasts and odontoblasts, leading to the formation of enamel and dentin, respectively.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 2-3 years - This is too early for the completion of crown formation of the maxillary canine. Primary teeth are mostly erupted by this age, and the development of permanent teeth like the maxillary canine would still be in its early stages.
- **Option B:** 8-9 years - This is later than the typical age for crown completion of the maxillary canine. By this age, most of the permanent teeth have erupted or are close to eruption.
- **Option D:** 12-14 years - This is significantly later than the crown completion of the maxillary canine. At this age, most permanent teeth have erupted, and the focus shifts to root completion and occlusion.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the timing of tooth development can vary among individuals, but there is a general timeline. The maxillary canine's crown completion at around 4-5 years is an important milestone. Clinicians often use these developmental milestones to assess dental age and plan orthodontic or restorative treatments.

## **Correct Answer:** . 4-5 years