Messenger of Allah said: "If it were not that it would be difficult on my nation, then I would have ordered them to use the Siwak for each prayer."  

قَالَ رَسُولُ اللَّهِ ﷺ لَوْلاَ أَنْ أَشُقَّ عَلَى أُمَّتِي لأَمَرْتُهُمْ بِالسِّوَاكِ عِنْدَ كُلِّ صَلاَةٍ  

'I heard Messenger of Allah saying: 'If it were not that it would be difficult on my nation then, I would have ordered them to use the Siwak for each prayer and to delay the Isha prayer until the third of the night.'"He [Abu Salamah, one of the narrators] said: Zaid bin Khalid wouId attend the prayer in the Masjid and his Siwak would be on his ear in the location of the pen on the ear of a writer. He would not get up to pray without cleaning his teeth, then returning it to its location."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لَوْلاَ أَنْ أَشُقَّ عَلَى أُمَّتِي لأَمَرْتُهُمْ بِالسِّوَاكِ عِنْدَ كُلِّ صَلاَةٍ وَلأَخَّرْتُ صَلاَةَ الْعِشَاءِ إِلَى ثُلُثِ اللَّيْلِ قَالَ فَكَانَ زَيْدُ بْنُ خَالِدٍ يَشْهَدُ الصَّلَوَاتِ فِي الْمَسْجِدِ وَسِوَاكُهُ عَلَى أُذُنِهِ مَوْضِعَ الْقَلَمِ مِنْ أُذُنِ الْكَاتِبِ لاَ يَقُومُ إِلَى الصَّلاَةِ إِلاَّ اسْتَنَّ ثُمَّ رَدَّهُ إِلَى مَوْضِعِهِ