Thanks for your detailed post. I've had two nights and days of improved dry eyes since using mouth guard (chemist bought - found one with an added thin separate layer which I removed after heating and fitting. It is thin, comfortable and doesn't fall out). I've had dry eyes for 3 yrs. I'm 66 yo woman.
For five years, I had severe dry, red, gritty, scratchy eyes, it was worse at night. I saw tons of specialist, MD and ND's. Tried eye drops, castor oil, vitamins, tear duct plugs and even the lipiflow was normal, nothing worked.
One day at the dentist, he began telling me he is shocked at the growing numbers of people that were clenching and grinding their teeth and that it had grown exponentially, in that last few years. To stop the patients teeth from being damaged he was making mouth guard. The dentist made me a custom made mouth guard for me and I started wearing it at night and I noticed that my dry eyes were cured! I could hardly believe it! You can buy mouth guards at the drug store it is cheaper. A custom made mouth guard from the dentist office is a perfect fit. I was totally unaware of this, but I was clenching my teeth at night. This causes muscle tightness, causes inflammation, then nerve compression of the tear ducts and effects your optic nerves and ear nerves! Grinding and clenching your teeth can also cause neck, shoulder, head tension and jaw pain. Since I like to look at the cause teeth grinding and clenching may be caused by stress, the pressures of the fast world or it could be a parasite infestation. Anyhow, I took up yoga, stopped caffeine and went on Hulda Clark's parasite cleanse. Anyhow, this might help someone that had the same problem as me