A scenario indicates ASA block is appropriate for what extent of maxillary teeth involvement?

• A. More than two maxillary teeth
• B. One to two teeth
• C. All maxillary teeth
• D. Only one tooth

Answer: (A)

The anterior superior alveolar block targets the maxillary anterior teeth, typically from the central incisor through the canine, along with the adjacent facial gingiva. That nerve territory usually covers three teeth, so this block is well suited when more than two maxillary teeth are involved. If only one or two teeth need anesthesia, a simple local infiltration near those teeth is usually sufficient and less invasive. For numbing all maxillary teeth, a broader approach such as an infraorbital or maxillary nerve block would be considered rather than the ASA block. Keep in mind that anatomical variation can occur, but the ASA block is designed for the anterior segment, not the entire maxillary arch.