佛說目連問戒律中五百輕重事經 2.52

2.52

問：「中食後口，得用楊枝不？」答：「得用，若不用純灰皁莢汁。都不用犯墮，過中亦犯墮。中後除藥，一切草木有形之味不得入口，犯捨墮。」

Question: "After the midday meal, may the mouth use a tooth-stick?"
Answer: "It may be used; or else use pure ashes and Chinese honey-locust juice. Not using anything at all incurs a pāyattika offense; using it past midday also incurs a pāyattika offense. Past midday, except for medicine, no tangible flavor of any grass or wood may enter the mouth; doing so incurs a naiḥsargika-pāyattika offense."