Efferdent PM Denture Cleanser cleans full plate dentures, partials, retainers and other dental appliances overnight. Its unique effervescence powers away tough stains and penetrates hard to reach places. Efferdent PM Overnight Denture Cleanser is specially formulated to fight plaque build-up and kill 99.9% of odor-causing bacteria, so you're ready to go out and enjoy life knowing your dentures are crystal clean. Be Your Effervescent Self.