**Core Concept**
Orthodontic extrusion of an intruded permanent incisor involves the gentle, controlled movement of the tooth out of the alveolar bone into the oral cavity. This procedure is often necessary after a traumatic injury, such as a blow to the mouth, which can cause the tooth to become displaced into the bone. The goal of orthodontic extrusion is to restore the tooth to its original position, reducing the risk of complications and promoting proper healing.

**Why the Correct Answer is Right**
The primary benefit of orthodontic extrusion is the prevention of root resorption, a common complication of intruded teeth. When a tooth is displaced into the bone, the periodontal ligament is damaged, leading to inflammation and potential resorption of the root. By extruding the tooth, orthodontists can reduce the pressure on the periodontal ligament, minimizing the risk of root resorption and promoting a healthier, more stable tooth. This is achieved through the controlled application of gentle forces, which stimulate the bone to remodel and accommodate the tooth's new position.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the benefits of orthodontic extrusion. While orthodontic treatment can improve the appearance of teeth, this is not the primary benefit of extruding an intruded incisor.
**Option B:** Orthodontic extrusion is not primarily used to treat pain. While it may alleviate some discomfort, this is a secondary benefit rather than the primary reason for the procedure.
**Option C:** Orthodontic extrusion does not directly address the issue of tooth mobility. While it may improve the stability of the tooth, this is not the primary goal of the procedure.

**Clinical Pearl / High-Yield Fact**
To remember the importance of orthodontic extrusion, recall the acronym "PRICE": **P** revent root resorption, **R** educe pressure on the periodontal ligament, **I** mprove tooth stability, **C**ontrol inflammation, and **E**nhance healing.

**Correct Answer:** C.