Braces (Passover) Status: Q. How should I clean out my child’s braces after he or she eats chametz for the last time before Pesach? A. We have been told by orthodontists that [for those people who do not have a water-flosser (e.g. Waterpik)] the best way to clean braces is to use a “proxa brush” which has a narrow bristled end that fits between the different wires and brackets. It is an inexpensive and effective tool for removing all residue from braces and other dental appliances.