I think you'll find most dentists have been using (mercury-free) white composite for fillings for quite a few years now.
the silver ones are still used for tother teeth as thye last longer.
Certainly used to be the case and maybe still is to a lesser extent, but amalgam fillings are not immune to deterioration either.
A common problem is that they slightly shrink through time allowing bacteria to invade around the 'seal' and therefore contributing to decay in behind the actual filling.
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composite is the main material option for white fillings on back teeth.
Glass ionomer is a different material.
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