Muhammad, from Muhammad ibn al-Husayn ibn Abi al-Khattab, from Safwan, from Ibn Muskan, from al-Halabi, who said: I (narrator) asked Abu Abdillah عليه السلام, peace be upon him: “May the fasting person clean his teeth (yastak) with water and a moist stick, while finding its taste?” Imam عليه السلام said: “There is no harm.”