Al-Kāfi - The Book of Fasting

Chapter: A Fasting Person’s Use of Tooth Brush ِنْ أَصْحَابِنَا عَنْ أَحْ٠َّدٍ عَنْ عَلِيِّ بْنِ الْحَكَ٠ِ عَنِ الْحُسَيْنِ بْنِ أَبِي الْعَلاءِ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ السَّلاَ٠) عَنِ السِّوَاكِ لِلصَّائِ٠ْ يَسْتَاكُ أَيَّ النَّهَارِ شَاءَ. 1.

A number of our people have narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from al-Husayn ibn abu al-‘Ala’ who has said the following: “I once asked abu ‘ Abd Allah (a.s.), about a man who brushes his teeth when fasting. He (the Imam) said, ‘Yes, he can brush his teeth any time during the day.’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (6/292))