Salam.ager roza ki halat ma dantoo sa khone aa jay tu roza toot jata ha.allah hafize
بسم الله الرحمن الرحيم
(Fatwa: 1522/1523/M=1430)
If the teeth bled while fasting and went inside throat, the fast will turn invalid if blood was more than saliva, but if the blood was less than saliva the fast will not be invalid. Likewise, if one spat the blood without swallowing, then also the fast will not be invalid, it will remain valid.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband