Final answer:
When booking an appointment to specify a tooth number and/or surface, use a dental procedure coding system like CDT codes, which are categorized by procedure type.
Step-by-step explanation:
When selecting the reason for an appointment that requires specifying a tooth number and/or surface, one would typically use a dental procedure coding system. In the United States, for instance, the Current Dental Terminology (CDT) codes are used. While the options given (misc., initial, add tx, category) do not directly correspond to CDT codes, the correct choice would likely be 'category' since dental codes are categorized by type of procedure. Specific codes within the correct category would then provide the ability to specify a tooth by its number and surface as required for treatment.