What's the best thing to help stop teeth grinding during day?

[Guest guest]

My 4 year old, 24 pound daughter has a horrible habit of grinding her

teeth. She ONLY does it when she is in intense concentration, such as

playing the computer, building blocks, cutting paper, etc. I really

want to help her before her teeth get ruined and before her big girl

teeth come in. Any suggestions would be GREATLY appreciated!!!! It

probably is a mineral imbalance but not sure what. She has high levels

of mercury, which we are chelating her for now. We just started her on

Nordic Naturals 2 days ago at a low dose of 1/4 teaspoon. We are

hoping it helps with her hyperactivity. Other than that, she is on

nothing but enzymes.

Thanks!

Sheryl

P.S. She doesn't do it at night, which is so weird! It is usually the

opposite.