What is the ruling on swallowing phlegm, or what one feels in the throat? And does swallowing what is in the mouth and throat, other than food, invalidate the fast? What is the ruling on the presence of a taste in the mouth or an odor, or swallowing a hot taste? And does clipping the nails inadvertently invalidate the fast, or the presence of water on the lips after rinsing the mouth?

1. Swallowing phlegm unintentionally does not invalidate the fast. If done intentionally, there is a difference of opinion regarding it, and it is permissible to follow those who do not consider it to invalidate the fast, to avoid hardship.

2. Expelling phlegm does not invalidate the fast.

3. The taste in the mouth does not necessitate rinsing, and ignoring it is valid. Similarly, water on the lips does not harm the fast.

4. The entry of an odor into the mouth does not invalidate the fast.

5. Clipping nails, whether intentionally or unintentionally, does not invalidate the fast.

6. Swallowing food residue present in the mouth does not invalidate the fast.