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I think it's a mixture of glass and plastics

I would wonder how toxic the plastic is. Dentists themselves are going to be the ones with the greatest exposure to any fumes, if anyone is to be kept in the dark about potential hazards it would be them.

I had to look into it, yes the plastic does release toxins and they have been working over the last ten years to stabilise composite and reduce it's rate of biodegridation, but for me it's the difference between chewing on plastic or chewing on mercury. I guess dentists believe what they have been taught, we know that there are many cases of doctors prescribing things in order that they themselves make a profit and perhaps dentists have added incentive to use certain products? There is no reason not to ban mercury fillings other than profit so my guess is that they make a tidy income for the governments that have not followed the EU ban, perhaps I will look into it further and no doubt the mercury comes from the same place as the mercury found in vaccines...

It would be more profitable for dentists to use solid gold fillings. How does the government make a tidy profit on mercury fillings?
Consider this, on their own sodium and chlorine are totally toxic and deadly, together they form table salt. California likes to label everything that it thinks could be potentially toxic I wonder if anyone is trying to apply that to dental amalgams. I looked and according to the FDA there are some risks from these amalgams so I guess the government is not trying to cover anything up.
https://www.fda.gov/medicaldevices/productsandmedicalprocedures/dentalproducts/dentalamalgam/ucm171094.htm#risks

Basically they say they do not recommend them for kids under 6 and that they may not be recommended for pregnant women.

Gold would be more profitable though not affordable to the masses, I also think the government does prefer to hoard gold for when the monetary system collapses and the value of gold sky rockets.. Though saying that gold is used in electronics which is generally irrecoverable after equipment is disposed of, who knows? It doesn't make sense to me that the FDA are stating it can be harmful as a neurotoxin for children yet is safe for an adult brain, a neuron is a neuron. I understand your point about salt being an inert and stable substance comprised of two quite dangerous substances though in the case of amalgam it has been shown not to be the case with mercury. Mercury is nasty stuff 🙁

It's not the best but it is more of a problem for developing neurons than those that are developed. When you are 5 and under your neurons are rapidly forming connections after that time mostly your neurons are editing their connections. It's the dentists themselves who are getting the highest exposure: http://amalgam.org/education/scientific-evidenceresearch/health-effects-from-dental-personnel-exposure-to-mercury-vapor-from-dental-amalgam/

Guess I should have called the post "are our dentists being poisoned?"... Many neurons are formed before the age of 5 but research is apparently showing that new neurons continue to grow and develop throughout our lives.

Or maybe "Our dentists are being poisoned!" I looked into a gold tooth when I had to get a filling because I didn't want the mercury but it would have been like $500-600 extra, hopefully an inexpensive and better solution can be found. Given the choice between getting a filling and having a slight mercury exposure and death from tooth decay if you don't get a filling though one imagines over the last 150 years amalgams have saved billions of lives.