I had the tmjd for 8 years. My first treatment consisted of wearing a bite plate for three months for 24/7, even while eating. It helped the headaches mainly. Then after that, I had to wear a different bite plate at night only. I got a little better as time went on, maybe 2 years or so after. But it didn't cure my tmjd, only relieved the extra pain in the joints from the clenching at night. I still wear the bite splint after all these years, and I am considering changing something, maybe the bite plate to something else, or stop wearing it. I really don't know at this point wait now. I am just looking at my other options.
That's just a brief history.