The most frequent tooth to be impacted is-
**Core Concept**
The question is testing knowledge of dental anatomy and oral pathology, specifically the common sites for tooth impaction. Tooth impaction refers to the failure of a tooth to erupt into the oral cavity due to various reasons such as overcrowding, cysts, or supernumerary teeth. The most common impacted teeth are those in the mandibular and maxillary arches.
**Why the Correct Answer is Right**
The maxillary third molar (wisdom tooth) is the most frequently impacted tooth due to its location in the upper jaw, which often results in insufficient space for proper eruption. This is often caused by the presence of a fully formed second molar or other obstructions. The impaction can lead to various complications such as cyst formation, pericoronitis, or damage to adjacent teeth.
**Why Each Wrong Option is Incorrect**
**Option A:** Mandibular third molar impaction is common, but not more frequent than maxillary third molar impaction.
**Option B:** Maxillary canine impaction is less common compared to maxillary third molar impaction.
**Option C:** Mandibular first molar impaction is not a common occurrence.
**Clinical Pearl / High-Yield Fact**
To remember the most common impacted tooth, use the mnemonic "M3" - maxillary third molar - and recall that it is more likely to be impacted due to insufficient space for proper eruption.
**Correct Answer:** C. Maxillary third molar