If you have clear aligners then these are a must! IXO’s Chewies aligner tray seaters are firm cylinders that help you seat your aligner and make your treatment proceed more smoothly and quickly. They can be cleaned with soap and water, or diluted mouthwash. Made of edible silicone, they're hygienic and safe to use. These dental chewies can last for weeks, making them the perfect aligner chewie. 1 box comes with 5 chewies.