Some important advice about retainers.
Retainers work only when they are in the mouth. Removable retainers should be in one of two places: in your mouth, or in the case your orthodontist gave you. Removable retainers should not be placed on cafeteria trays. They can be thrown away quite easily. Removable retainers should not be wrapped in napkins or placed in pockets or purses. Napkins get tossed into the trash, retainers fall out of or get broken in pockets or purses. Keep retainers out of the reach of pets. Dogs in particular are attracted to retainers.