In spite of the dental propoganda my experience is a loud "NO, amalgams DO NOT outlast white fillings."
I read on a dental booster dite that "a properly installed and polished amalgam could easily last a lifetime." That was indeed among the STUPIDEST thing I have ever read on my computer screen.
It COULD be true but only if you were run over by a bus on the way home from the dentist.
Amalgams are EASY for the dentist to do...THAT'S why the almost 2 century old idea of sticking a 50-50 mix of MERCURY and silver in the mouth survives today. Poisonous and Brittle hangovers from the days long gone.
Amalgams are a good way for dentists to get repeat business.
The HATEFUL aspect of putting in a amalgam (other than the poison) is that it is not cemented in and thus the tooth must be undercut, the hole made larger on the bottom than the top...think an upside down keystone.
This removes FAR too much healthy tooth and after the third replacement the tooth is GONE!