Riyad as-Salihin 1197
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] .
وعن حذيفة رضي الله عنه، قال‏:‏ كان رسول الله صلى الله عليه وسلم، إذا قام من النوم يشوص فاه بالسواك‏.‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏