I have had TMJ syndrome for 15 years (headaches and jaw pain) and I was using a bite guard, which is basically the kind of thing that boxers wear. Unfortunately, a bite guard doesn't stop you from grinding your teeth, it just minimizes the damage. Meanwhile, I have been suffering from chronic sinus problems that I thought were caused by allergies (but which were not really helped by meds or nasal sprays). I recently noticed that I had practically chewed through my bite guard so I went to the dentist. He gave me a new kind of dental appliance called an NTI (see <www.nti-tss.com> ). This appliance goes on the front teeth and prevents tooth grinding by keeping the molars from coming together. The first morning, I woke up without a headache, but also, without a stuffy nose for the first time in decades. I called the dentist and asked him if tooth grinding could have been causing my sinus problems, and he said yes! See <www.drjimboyd.com/book/8th_sth.htm> for a discussion (kind of technical) about tooth grinding and sinus problems.
Good luck!
Rebecca
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Sinus problems and tooth grinding 
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