Al-Kāfi - Volume 3 > Brushing One’s Teeth
Hadith #6

6ـ أَحْمَدُ بْنُ إِدْرِيسَ عَنْ مُحَمَّدِ بْنِ عَبْدِ الْجَبَّارِ عَنْ صَفْوَانَ عَنِ الْمُعَلَّى أَبِي عُثْمَانَ عَنْ مُعَلَّى بْنِ خُنَيْسٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنِ السِّوَاكِ بَعْدَ الْوُضُوءِ فَقَالَ الاسْتِيَاكُ قَبْلَ أَنْ تَتَوَضَّأَ قُلْتُ أَ رَأَيْتَ إِنْ نَسِيَ حَتَّى يَتَوَضَّأَ قَالَ يَسْتَاكُ ثُمَّ يَتَمَضْمَضُ ثَلاَثَ مَرَّاتٍ. وَرُوِيَ أَنَّ السُّنَّةَ فِي السِّوَاكِ فِي وَقْتِ السَّحَرِ.

6. Ahmad ibn Idris has narrated from Muhammad ibn ‘Abd al-Jabbar from Safwan from al-Mu‘alla’ abu ‘Uthman from Mu’alla’ ibn Khunays who has said the following: “I once asked abu ‘Abd Allah, ‘Alayhi al-Salam, about brushing one’s teeth after Wudu’. He (the Imam) said, ‘Brushing is before Wudu’.’ I then asked, ‘What should one do if he forgets and remembers only after Wudu’?’ He (the Imam) said, ‘In such case he should brush and then rinse his mouth three times.’”