Abu Musa Al-Ash'ari (May Allah be pleased with him) reported:
I came to the Prophet (ﷺ) once and noticed the tip of Miswak (tooth-stick) on his tongue.[Al-Bukhari and Muslim]. (JA)
App reference (JA): Book 9, Hadith 211 (JA)
Arabic/English book reference (JA): Book 9, Hadith 1201 (JA)