This is an important subject.
I am proof of fact amalgam lasts longer. I have different types of fillings in my mouth yet the amalgam are best shape where composite has fractured and needs to be fixed after 3 years.
This is not a proof and you considering this a proof demonstrate some negligence on your part.
And why would I use fluoride and keep using fluoride toothpaste as oral health care worker?
This is not a proof either. Whether or not fluoride has more benefits and risks isn't what I want to highlight. I just want to highlight that you're not bringing proof for any of your claims.
Thank you @teamsteem for bringing some sanity!