Hudaifah (May Allah be pleased with him) reported:
Whenever the Messenger of Allah (ﷺ) got up (from sleep), he would rub his teeth with Miswak (tooth-stick).[Al-Bukhari and Muslim]. (ES)
App reference (ES): Book 9, Hadith 207 (ES)
Arabic/English book reference (ES): Book 9, Hadith 1197 (ES)