NTI (Nociceptive Trigeminal Inhibition) is a small plastic device that is designed to prevent headaches and migranes. The teeth will wear down caused by stress related clenching and grinding. The NTI device relaxes the muscles and TMJ (Temporomandibular Joint) involved in clenching and teeth grinding. It is fitted by Dr. McCormick who is trained in the technique and is worn at night.