Authentic hadithNarrated by Bukhari & Muslim
When the Prophet (may Allah's peace and blessings be upon him) got up at night, he would cleanse his mouth with Siwak (tooth-stick)
عَنْ حُذَيْفَةَ رضي الله عنه قَالَ: كَانَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ إِذَا قَامَ مِنَ اللَّيْلِ يَشُوصُ فَاهُ بِالسِّوَاكِ.
Explanation
The Prophet (may Allah's peace and blessings be upon him) would often use the Siwāk and command the Muslims to use it. This practice was confirmed at certain times, like getting up during the night, as he (may Allah's peace and blessings be upon him) would brush and cleanse his mouth with the Siwāk.
Source
صحيح البخاري (1/ 58) (245).
صحيح مسلم (1/ 220) (255).
تيسير العلام شرح عمدة الأحكام، للبسام (ص47).
خلاصة الكلام شرح عمدة الأحكام، لفيصل آل مبارك (ص24).
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