To care for your mouth guard: You can clean your mouthguard with mild soap and water or rinse it with cold water before and after each use. To store or transport the mouthguard, place it in a firm, perforated container. This will allow air to circulate and prevent damage. If your mouthguard is acrylic, place it in fresh, clean water. The mouthguard should be protected from exposure to high temperatures, such as hot water, hot surfaces, or direct sunlight, to prevent distortion. Check the mouth guard periodically for general wear and tear. Replace it if you find holes or tears in it, if it becomes loose or causes discomfort. You should bring your mouthguard to every dental appointment to be examined by your dentist.