# Case Hygiene Guide > Cases harbor moisture and biofilm. Simple cleaning keeps them fresh. Includes simple steps and when to ask a dentist. ## Guides - [Cleaning a Retainer Case](https://cleaning-dental-appliance-cases.rujopujo.workers.dev/retainer-case-cleaning/): Retainer case cleaning comes down to a daily rinse, a regular wash with mild soap and warm water, and letting the case dry fully. - [Cleaning an Aligner Case](https://cleaning-dental-appliance-cases.rujopujo.workers.dev/aligner-case-cleaning/): Aligner case cleaning works best as a quick rinse after each use and a regular soap wash, followed by thorough drying. - [Cleaning a Denture Case](https://cleaning-dental-appliance-cases.rujopujo.workers.dev/denture-case-cleaning/): Denture case cleaning means emptying and rinsing the case every day, washing it with mild soap and a soft brush regularly, and letting it dry between uses. - [Drying the Case Explained Simply](https://cleaning-dental-appliance-cases.rujopujo.workers.dev/dry-the-case/): A damp, closed case is a comfortable place for microbes, so it makes sense to dry the case after rinsing and leave it open between uses. - [Replacing a Worn Case](https://cleaning-dental-appliance-cases.rujopujo.workers.dev/replace-cases-yearly/): Many people hear that you should replace cases yearly, but that figure is a convenient rule of thumb, not a tested deadline. ## About - [About Case Hygiene Guide](https://cleaning-dental-appliance-cases.rujopujo.workers.dev/about/): not medical advice, how the site is funded and how guides are made ## Optional - [RSS feed](https://cleaning-dental-appliance-cases.rujopujo.workers.dev/feed.xml)