Final answer:
CW3 Clark's grounding period after a root canal with local anesthetic depends on the specific regulations of his organization and his recovery. There's no universal grounding time, and a medical officer or relevant authority will determine the exact duration based on his circumstances.
Step-by-step explanation:
The question concerns CW3 Clark who recently underwent a root canal and used a local anesthetic. In the context of aviation, military, or similar occupations where individuals operate machinery, there are usually protocols regarding what is termed as 'grounding' after certain medical procedures or medications have been administered. Grounding refers to a temporary period where the individual is not cleared to operate or fly until they have sufficiently recovered or the effects of a medical procedure have diminished.
The precise duration of grounding can vary depending on the specific guidelines of the organization and the individual's health and recovery rate. Usually, after dental procedures like a root canal, grounding can be from a few hours to several days. However, for an accurate duration, it would be necessary to consult the specific regulations of the military branch or aviation authority that CW3 Clark is associated with, as well as possibly their medical officer for a personalized assessment.