I'm glad to hear you now know about this.

If you ever feel feisty, print this and give a copy to your dentist:

http://mercurytalk.com/wiki/index.php/Fast_Facts_About_Mercury_From_The_CDC

Now, if you really want to blow their minds, you can give them copy of this professional rebuttal to the well-known deceitful report that all conventional dentists hide behind that says that mercury is perfectly safe. The information in this statement is beyond a flawed study: It's a lie.

Here is the rebuttal:

http://iaomt.org/articles/files/files222/A%20Scientific%20Response.pdf

And here is another document that every dentist should have to read:

http://iaomt.org/articles/files/files193/The%20Case%20Against%20Amalgam.pdf

Enjoy!