What is the most common supernumerary tooth?

• A. Mandibular premolars
• B. Maxillary lateral incisors
• C. Maxillary fourth molars
• D. Mesiodens

Answer: (D)

The main concept here is the typical location and frequency of supernumerary teeth. The most common supernumerary tooth is the one that sits between the two maxillary central incisors—in other words, a mesiodens. This type accounts for the majority of extra teeth encountered in the mouth, often presenting as a small, peg-shaped tooth that can be conical or upright between the central incisors. Because of its position, a mesiodens frequently causes eruption problems or a midline diastema, so it’s commonly detected on routine radiographs or when spacing issues arise. Radiographic evaluation is key to confirming its presence and planning management, which may involve extraction if it interferes with eruption or alignment, or monitoring if it’s asymptomatic. The other locations listed—such as in the mandibular premolar area, the maxillary lateral incisor area, or the rare maxillary fourth molar region—occur far less often, which is why mesiodens is the correct answer.