You should wear your retainers every night for a lifetime. You simply have to wear them every night so that your teeth do not shift. Please keep them at home so that you do not lose them or accidentally throw them away. We can definitely replace them, however, there is a replacement retainer fee. The best way to clean your retainers is with a toothbrush, toothpaste and cold water in the morning when you wake up. You can also soak your retainers in denture cleaner in cold water when you are not wearing them for extra cleanliness.