Every year, we are asked numerous questions about how to deal with our orthodontic appliances in preparation for Pesach. This seems like a very reasonable concern. After all, what could be more critical to clean for Pesach than something that is placed in the mouth? It would be a shame to go through all the trouble of replacing garbage cans and boiling doorknobs and then insert a retainer filled with challah in your mouth during the Pesach Seder.