Dirty oral appliances can contribute to receding gums, a condition where the gum tissue pulls back from the teeth or oral appliance surfaces. When oral appliances aren't cleaned properly, harmful bacteria and plaque accumulate on their surface and in the mouth, leading to gum inflammation, infection, and unpleasant side effects like bad breath and a visibly dirty smile. Over time, this can weaken the gum tissue, causing it to recede and exposing the underlying bone. Maintaining proper oral appliance hygiene is essential to prevent gum issues, eliminate odor, preserve a bright, clean smile, and ensure a healthy, comfortable fit.