Response: Blood which comes out from between the teeth accidentally does not break the fast, whether it is from oneself or having been hit.
And with Allaah lies all the success, and may Allaah send prayers and salutations upon our Prophet Muhammad (sal-Allaahu `alayhe wa sallam) and his family and his companions.
The Permanent Committee for Islaamic Research and Fataawa, comprising –
Head: Shaykh ‘Abdul ‘Azeez ibn Abdullaah ibn Baaz;
Deputy Head: Shaykh ‘Abdur-Razzaaq ‘Afeefee;
Member: Shaykh ‘Abdullaah Ibn Ghudayyaan
Fataawa Ramadhaan – Volume 2, Page 480, Fatwa No. 422;
Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. – Fatwa No.6132. fatwaonline.com