Our dental repair tool includes a PU sponge. It's a professionally designed compact and lightweight tool that helps carry quickly and can remove surface stains on teeth for whitening purposes. It restores a bright smile anytime, anywhere. Its usage is simple: rinse your mouth with water after use, gently wipe surface stains with a cloth, and wipe the sponge with warm water. It's made from PU sponge, which is gentle and non-irritating for all types of teeth