Look into magnesium supplementation with high vit D3 doses and Vit C (as sodium ascorbate).
The bruxisim can be eased by using the minerals that merury depletes, magnesium chief among them. Griding teeth is all about overtensed muscles, and magnesium governs the relaxation state of muscles.
Vit D3 allows your intestines to absorb the minerals you need, full-force. If you take it when magnesium-deprivd, you can observe the function of your muscles shivering to absorb it from your bloodstream. VitD3 also provides DNA-protection when combined with Zinc.
Vit C neutralizes mercury's activities through several pathways, and helps relieve the symptoms associated with it.