What is the ruling on a fasting person unintentionally swallowing blood and yellow fluid discharged from their infected teeth?

We have previously clarified that intentionally swallowing blood from the gums invalidates the fast. However, swallowing blood or other things that invalidate the fast while asleep does not affect the validity of the fast, due to lack of intent. Some jurists mentioned that whoever is afflicted with bleeding gums, such that it flows constantly or frequently, is excused for what is difficult to guard against. It is sufficient for him to spit it out, and its trace is overlooked. His fast is valid even if he swallows it while knowing about it and having no alternative. The sick person is permitted to avail himself of the concession, even if he does not seek treatment.