Do not use: If you are under 18 years of age. If you wear braces, dentures, or other dental products. If you can wiggle any of your teeth. If your dentist told you that you have TMJ. If you have any tooth or jaw pain, or pain with bruxing or tooth grinding. As an athletic mouth guard. Product does not absorb shock. For more than three months without consulting your dentist. Ask a dentist before use if you have: Loose fillings, loose caps, or cavities with no fillings. Clicking of your jaw. Jaw pain, teeth pain, face pain, or have a hard time chewing. Two or more missing teeth. Mouth sores. Gum disease or bleeding gums. Serious breathing, respiratory, or other health problems. When using this product: See your dentist every six months. Stop use and ask a dentist if: Your same symptoms last even after several weeks of use. The product easily falls out of your mouth. The product causes you to gag or feels uncomfortable. You have bleeding gums, soreness, or other reaction inside your mouth. You notice new symptoms (jaw pain, teeth pain, ear pain, headache, neck stiffness, or joint clicking) because of the product. You have loose teeth or a change in your bite that lasts more than a few minutes after taking product out.