Final answer:
The mandibular right central incisor is tooth number 25 in the Universal Numbering System used by the armed services.
Step-by-step explanation:
In the numbering system used by the armed services, also known as the Universal Numbering System for teeth, the mandibular right central incisor is designated as tooth number 25. This system is commonly used by dentists in the United States to identify teeth. In this system, the permanent teeth are numbered from 1 to 32, starting with the maxillary right third molar (wisdom tooth) as number 1, moving around the upper teeth to the maxillary left third molar as number 16, then dropping down to the mandibular left third molar as number 17 and moving across the lower teeth to the mandibular right third molar as number 32. Thus, the central incisors in the lower jaw (mandible) would be numbers 24 (mandibular left central incisor) and 25 (mandibular right central incisor).