Hadith 110

Sahih Bukhari

Book 4: Ablutions (Wudu')

Chapter 73

Siwak (to clean the teeth with Siwak which is a tooth-brush in the form of a pencil from the roots of the Arak tree

باب السِّوَاكِ

Ibn ‘Abbas said, “Once I passed the night with the Prophet ﷺ and saw him cleaning his teeth (with Siwak).” ​​
وَقَالَ ابْنُ عَبَّاسٍ بِتُّ عِنْدَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَاسْتَنَّ.
Sahih al-Bukhari 244
حَدَّثَنَا أَبُو النُّعْمَانِ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ غَيْلاَنَ بْنِ جَرِيرٍ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِيهِ، قَالَ أَتَيْتُ النَّبِيَّ صلى الله عليه وسلم فَوَجَدْتُهُ يَسْتَنُّ بِسِوَاكٍ بِيَدِهِ يَقُولُ ‏ ‏، وَالسِّوَاكُ فِي فِيهِ، كَأَنَّهُ يَتَهَوَّعُ‏.‏
"‏ أُعْ أُعْ ‏"
Abu Burda:

My father said, "I came to the Prophet (ﷺ) and saw him carrying a Siwak in his hand and cleansing his teeth, saying, 'U' U'," as if he was retching while the Siwak was in his mouth."