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]. (ID)
App reference (ID): Book 9, Hadith 211 (ID)
Arabic/English book reference (ID): Book 9, Hadith 1201 (ID)