Off and on in my adult dental history, I have suffered from sore jaws and even headaches, which were diagnosed as TMJ problems. I have have my teeth ground down to improve my bite, I have had expensive retainers made to wear at night; both of which finally helped illiminate the pain. But after being pain free for about ten years I went to the dentist thinking I had a cavity because some of my teeth ached. He didn't find a cavity but pointed to the tissue around the roots of my teeth and commented that they looked peculiar, but said nothing more about it. My teeth then started aching more and more, mostly when I chewed. I could tell now that the pain wasn't caused by cavities and deduced for myself that my TMJ problems were probably coming back. I didn't want to go back to the specialist that had treated me ten years ago. We did not have insurance this time and I couldn't afford the $600 for another retainer (I had long since lost the other one because I hadn't worn it forever). So I got thinking, if I could just make something soft to cushion my teeth at night that might help. (I had awoken one night and found myself clenching my teeth. I never realized I did that before). Enought said, I created my Nite Bites and my teeth pain and occasional head ache has gone away. One night however, I was too tired to make one, so I didn't wear it, and sure enough the next day my teeth hurt while I was eating. It took a couple of days of wearing the Nite Bite for the pain to subside.
Use 2mm thick Foamy sheets purchased at any craft store.