Probably because the verbal gymnastics the ADA and its associates parlay back and forth regarding silver amalgam fillings allows them to believe the official statement ADA put out years ago.
If silver elemental mercury fillings weren't toxic, why does the ADA have a gag rule in place, violation costs a dentists license, prohibiting practitioners from speaking ill of silver elemental mercury fillings? Dr. Larry Hanus could share some insight on that one.
The FDI World Dental Federation and the World Health Organization concluded in a 1997 consensus statement
[SUP]i[/SUP]: “No controlled studies have been published demonstrating systemic adverse effects from amalgam restorations.”
Statement on Dental Amalgam
Consider the keywords in that statement. "Controlled studies" . No controlled studies have been published....That's because no controlled studies have been executed.
Further, when over 100 million Americans, that's not counting world wide, have silver amalgam, a composite of tin, silver, copper, and with mercury as a binding agent, implanted in their teeth, while the large vein under the tongue, the lingual vein, absorbs fluids and properties that begin to digest in the mouth due to the enzyme production of saliva, and transport said properties directly to the blood stream, you're talking about a huge liability if ADA and their associates found otherwise.
While elemental mercury is toxic.
This is also why the CFB's, compact fluorescent bulbs, now becoming the norm in most American homes, along with LCD's, are dangerous. Though standard light bulbs are now illegal to manufacture as of this year. CFB's contain mercury. If they break the vapor releases into your home and puts everyone at risk. This is why vacuuming is highly dangerous when that bulb breaks because the vacuum disperses the vapor at a broader scale. Anyone with asthmatic members in the house, or pets, and of course babies, need avoid CFB's.
And when they burn out, you can't throw them in the trash. It's an EPA health hazard. You have to collect them and dispose of them legally when your state has hazardous household waste collection drives.
Now, if mercury vapor in CFB's is toxic, no one should convince you elemental mercury in your fillings in your mouth, that consumes acidic foods, which wear down and oxidize silver, as well as other foods that affect the silver, which is loaded with the elemental mercury binder, is not.
This is why the ADA offers porcelain fillings as a substitute or replacement for silver mercury fillings. A 'viable option', without admitting elemental mercury in silver amalgam is toxic. And why many dentists don't use silver fillings any more. Those in my area don't.
Money! Liability! 100 million lawsuits.
Don't let the false propaganda fool you. Do the research. Elemental mercury is toxic. ADA doesn't change that fact with their failing to perform controlled studies that would need be published. See how they word their out? Yep. That's big business knowing exactly what it's doing. To you.