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If you're making wudu and blood comes from your teeth, do you have to make wudu all over again? When you make wudu and you blow out blood, do you have to start your wudu over again?
Praise be to Allah.
May Allah reward you for your question.
Regarding the effusion of blood from between the teeth, it does not nullify the wudu as long as it is minor (i.e. not profuse or a large amount), even if one ejects it from his mouth.
For more, please see these answers: 3624, 147126, and 2176.
And Allah knows best.