Yes grinding is due to the mercury and since removal stirs up mercury my teeth could definetly be sore from grinding during the day. The NTI does help at night - I used to wake up with jaw and facial pain all the time. I am going back today for another bite adjustment. I am not thinking it is probably anything bad because the pain comes and goes. After awhile though of having so many things hurt and ache and then you get the fillngs out to help you, I started to think "oh no now I'm going to have tooth pain on top of it all." I know removing the mercury was my best health decision though. I am looking forward to good health and fertility!