A Palate Expander Sweeper is a flexible plastic tool that you can use to clean food debris out from under a Palate Expander. Depending on the type of Palate Expander that you have, food can get caught between your Palate and the Expander device. An Expander Sweeper (such as the one made by L’il Palates), found at DentaKit.com, helps to clear away the food that is caught. If you don’t have an Expander Sweeper, you can use a long-handled interproximal brush to clear away the trapped food.