Riyad as-Salihin 1201

I came to the Prophet (may Allah's peace and blessings be upon him) while he was cleansing his mouth with a ripe tooth-stick. The edge of the tooth-stick was on his tongue and he was making a sound like: “ugh, ugh” as if he was heaving, and the tooth-stick was in his mouth

Abu Mūsa al-Ash‘ari (may Allah be pleased with him) reported: I came to the Prophet (may Allah's peace and blessings be upon him) while he was cleansing his mouth with a ripe tooth-stick. The edge of the tooth-stick was on his tongue and he was making a sound like: “ugh, ugh” as if he was heaving…

دَخَلْتُ عَلَى النَّبِيِّ صلى الله عليه وسلم وَطَرَفُ السِّوَاكِ عَلَى لِسَانِهِ ‏.‏

Narrated by Abu Mūsa al-Ash‘ari Explained

My father said, "I came to the Prophet (ﷺ) and saw him carrying a Siwak in his hand and cleansing his teeth, saying, 'U' U'," as if he was retching while the Siwak was in his mouth."

يَسْتَنُّ بِسِوَاكٍ بِيَدِهِ يَقُولُ ‏"‏ أُعْ أُعْ ‏"‏، وَالسِّوَاكُ فِي فِيهِ، كَأَنَّهُ يَتَهَوَّعُ‏.‏

Narrated by Abu Mūsa al-Ash‘ari

On the authority of his father ( Abu Musa al-Ash'ari), reported (according to the version of Musaddad) : We came to the Apostle of Allaah (sal Allaahu alayhi wa sallam) to provide us with a mount, and found him using the tooth-stick, its one end being at his tongue (i.e. he wsa rinsing his mouth)…

يَسْتَاكُ عَلَى لِسَانِهِ -

Narrated by Abu Mūsa al-Ash‘ari