Sunan an-Nasai, hadith 3

This brief but vivid hadith captures a small, intimate detail of the Prophet's ﷺ personal hygiene: while using the siwak, he would work the tip of it far enough back to reach the base of the tongue, producing a gagging or clearing sound rendered in Arabic as 'aa, aa,' a detail so specific and unglamorous that scholars point to it as strong evidence of the report's authenticity, since it is exactly the kind of unpolished, close-range observation only someone who had genuinely walked in on the Prophet ﷺ mid-activity would preserve. This placement of the siwak, reaching to clean the tongue and not merely the teeth, established a fuller standard for oral hygiene practice than surface-level brushing alone.

The broader principle here is that the sunnah of siwak use extends beyond simply possessing or occasionally using a tooth-stick; it includes a specific, thorough method, cleaning the tongue as well as the teeth, which later scholars incorporated into detailed descriptions of the recommended manner of using the siwak. This reflects a consistent pattern across many prophetic hygiene practices: the Sunnah frequently specifies not just that something should be done, but precisely how, reflecting the same thoroughness seen in hadiths about wudu and other purification rituals.

Abu Musa al-Ash'ari's account of walking in on the Prophet ﷺ using the siwak reflects the general openness and informality of daily life within the early Muslim community in Madinah, where close Companions had regular, unscheduled access to the Prophet's ﷺ home and personal space, allowing them to observe and later transmit even small, private habits that would otherwise have gone unrecorded. Such intimate details, preserved specifically because a Companion happened to witness them directly, form an important category of hadith material distinct from the Prophet's ﷺ public sermons and formal teachings.

Commentators on Sunan an-Nasa'i, including the detailed marginal notes by Imam as-Sindi found in most printed editions of the collection, cite this hadith as evidence that the recommended method of siwak use includes reaching the back of the mouth and tongue, not merely brushing the front teeth, and they connect this report to broader fiqh discussions establishing the full scope of the mustahabb (recommended) practice of siwak across the legal schools.

Scholars also note the value of this particular hadith as a methodological example within hadith studies: its very specificity, an odd gagging sound rendered phonetically in the text, is treated by hadith critics as a marker of authenticity, since fabricators inventing a saying to attribute false piety to the Prophet ﷺ would have little motive to include such an unglamorous, almost comedic physical detail; this is part of a broader scholarly principle that unpolished, seemingly incidental details in a narration often strengthen rather than weaken confidence in its authenticity.

This hadith gives Muslims a specific, practical refinement to apply when using a siwak or, by extension, when brushing teeth generally: extend the cleaning motion further back to include the tongue, not just the front teeth, mirroring the thoroughness the Prophet ﷺ modeled here. Given that oral bacteria accumulate heavily on the tongue's surface, this small addition to a daily hygiene routine directly reflects both the letter and the wisdom of the sunnah.

More broadly, this hadith is a reminder that Islamic teachings on personal hygiene are rarely satisfied with minimal effort; where a task is worth doing, the sunnah tends to specify doing it thoroughly. Muslims can apply this principle beyond oral hygiene as well, approaching daily acts of self-care, washing, grooming, and cleanliness generally, with the same standard of unhurried thoroughness the Prophet ﷺ is repeatedly shown to have practiced in these small hadiths.

This hadith reveals the Prophet's ﷺ genuine, unselfconscious thoroughness in matters of personal hygiene, carried out fully even in private moments with no audience to witness or approve of the effort, showing a consistency between his public teaching on cleanliness and his actual private practice down to the smallest physical detail.

Abu Musa al-Ash'ari was renowned among the Companions for his exceptionally beautiful Qur'anic recitation, which the Prophet ﷺ himself once remarked upon, comparing his voice favorably to the musical instruments of the family of Dawud. He went on to serve as a governor and judge under 'Umar and 'Uthman, and his frequent, close access to the Prophet's ﷺ household, reflected in this very hadith, made him a valuable source for small, personal details of prophetic life that most Companions would never have had occasion to witness directly.

I walked in on him that morning without any particular expectation, only to find him deep in the unhurried task of cleaning his mouth, the siwak reaching so far back that he made the strangest little sound, 'aa, aa,' as it touched the base of his tongue. I remember almost smiling at how ordinary the moment was, how thoroughly human, and yet I never forgot it, because even in this small unwitnessed act, done for no audience but himself, he did it properly, all the way, leaving nothing half finished. It taught me something about care that no sermon ever could have. (Creative narrative based on authentic hadith)

Modern dental research has consistently shown that the tongue's surface harbors a significant proportion of the bacteria responsible for oral malodor and plaque formation, and dental associations today explicitly recommend tongue cleaning as part of a complete oral hygiene routine, a practice this hadith shows the Prophet ﷺ modeling in specific physical detail well over a thousand years before this connection was established in modern dental science.

You realize your own daily teeth-cleaning routine has become rushed and superficial, focusing only on the front teeth out of habit rather than genuine thoroughness. Reflecting on the specific, unhurried care the Prophet ﷺ is shown taking in this hadith, even reaching the back of his tongue, what small, concrete change could you make to your own routine tomorrow morning to bring a bit more of that same intentionality into an ordinary daily habit?