عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ: لَوْلاَ أَنْ أَشُقَّ عَلَى أُمَّتِي ـ أَوْ عَلَى النَّاسِ ـ لأَمَرْتُهُمْ بِالسِّوَاكِ مَعَ كُلِّ صَلاَةٍ.
Hazrat Abu Hurairahra narrated that Allah’s Messengersa said: “If it were not for the hardship it would bring upon my ummah – or upon the people – I would have commanded them to use the siwak [i.e., clean the teeth] before every prayer.”
(Sahih al-Bukhari, Kitab al-jumua, Bab as-siwak yawm ajumua, Hadith 887)