The first cleaner to combine ultrasonic and UV cleaning. Designed to clean clear aligners, retainers, sport mouthguards, nightguards, bruxism appliances, TMJ appliances, dentures, water flosser tips, and even toothbrush heads. Compact design wont take up counter space. Durable, stainless steel reservoir fits multiple items. Cleans with just water. The Smile Direct Club smile spa is the first cleaner to combine ultrasonic and UV cleaning. It thoroughly cleans all sorts of mouth gadgets clear aligners, retainers, sport mouthguards, nightguards, bruxism appliances, TMJ appliances, dentures, water flosser tips, and even toothbrush heads. It kills 99% of odor-causing bacteria with two 5-minute cleaning cycles. The durable, stainless steel reservoir is large enough to clean multiple items at once. Just add water. Or combine with one of our universal cleaning tablets for a minty-fresh clean.