If someone went to the dentist for cleaning, for a filling, or for extracting a tooth, his or her fast is at a huge risk. There is the possibility that some liquid or blood could go down the throat. It is nearly impossible to avoid it so the fast will be broken. If bleeding from the gums occurs both spontaneously or as a result of treatment, and the blood went down the throat, the fast will be broken (though it wouldn’t break if one spat it out) and nothing went down the throat.

Extracted from A Gift for Ramadhan, Page 53.

A Gift For Ramadhan – New 3rd Revised Edition