Do not use: if you are under 18 years of age; if you wear braces, dentures or other dental appliances; if you can wiggle any of your teeth; if your dentist has told you that you have TMJ; if you have any tooth or jaw pain, or pain with bruxing or tooth grinding; as an athletic mouthguard; 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 the product out.