لَوْ لَا أَنْ أَشُقَّ عَلَى أُمَّتِي لَأَمَرْتُهُمْ بِالسِّوَاكِ عِنْدَ كُلِّ صَلوٰةٍ. (Jāmiʿ al-Tirmidhī, 22)
Translation: Were it not that I would cause hardship to my community, I would command them to use the tooth-stick at every prayer.
1. Siwāk (مسواک): a tooth-cleaning stick.