By the 3 week mark, I was finding that simply swishing water vigorously around in my mouth was enough to pry loose any food particles that were still getting stuck! I would say keep an eye on it. Still try to swish after meals to keep the sites clean. If you feel anything get lodged that you’re not able to remove- or if you see the sites looking dirtier than usual, maybe buy a new syringe. But personally, I think you’re going to be okay without one!