Does cleaning, filling, extracting, or injecting an anesthetic into a tooth affect the fast?

What is mentioned in the question has no effect on the validity of the fast, as it is excused. One should, however, be careful not to swallow any medicine or blood. The aforementioned injection has no effect on the validity of the fast, as it is not in the meaning of eating and drinking. The basic principle is the validity and soundness of the fast.