Ask a Dentist Before Use if You Have: Loose caps or fillings, or cavities without fillings. Clicking of your jaw. Pain in your teeth, jaw, face, or if you have trouble chewing. Two or more missing teeth. Sores in your mouth. Disease or bleeding of the gums. Serious breathing, respiratory, or other health problems. Please read and follow additional warnings and instructions on enclosed insert. Do Not Use: If you are under 18 years of age. If you wear braces or other dental appliances. If you have loose teeth. If you have been diagnosed with temporo-mandibular joint (TMJ) problems. If you are currently experiencing pain in the mouth or jaw because of tooth clenching or grinding. As an athletic mouth guard. (The dental protector does not absorb shock). For more than 3 months from initial use without consulting your dentist. See your dentist every six months thereafter while using this product.