When cases for dentures, retainers, or mouth guards aren’t cleaned properly, they become breeding grounds for harmful bacteria. Every time you place your appliance back in your mouth, you transfer that bacteria onto your teeth and gums — leading to foul breath, plaque buildup, and even cavities. Over time, this hidden contamination can weaken enamel, irritate gum tissue, and compromise your oral health. Keeping your case clean is just as important as cleaning your appliance itself to protect your smile, prevent odor, and stop decay before it starts.