Money! Amaglams cost a $1.00, composites way more. And if the ADA were to admit that this stuff makes people sick, can you imagine the flood of lawsuits? There would be mass chaos in America. People trust way to easily. They beleive the ADA is a "god-like" organizatin put there to protect them. IN fact, it is a club of dentist who happen to agree on the same way of practicing dentistry. Many Americans are generally blind. They take everything at face value and question nothing. Shame really. Doctors in the 1890's were diagnosing illness from amalgam. They were familiar with poisoning and its symptoms. Physicians today are trained to treat the symptoms, not find the cause. And most doctors think that dental problems belong to dentists, and dentist think that illness other than the teeth belongs to doctors.
I think instead of paying them when we get sick. We should pay them to keep us health. If you got sick, you would stop paying until they go you well. HOW IS THAT FOR MOTIVATION!