Ruling 216
If some food has remained between the teeth and blood comes in the mouth, the food does not become impure by coming into contact with the blood.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
Purity: Ruling on Food Between Teeth When Blood Appears in the Mouth
Practical Laws of Islam as per the teachings of Ayatullah Sistani
