What is it? This device is specifically designed to relax your jaw and neck muscles. There is much evidence that many symptoms of head and neck pain can be eliminated by positioning the jaw where the muscles are the most relaxed. This machine allows me to work with clients who experience head and neck pain to alleviate their symptoms. For patients with jaw pain, neck pain, headaches, migraines, and those who clench and grind their teeth, this instrument helps a great deal.