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 > How long should the metallic taste from new silver dental fillings last?
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A Silver filling is a "POLY-EUTECTIC SOLID SOLUTION" consisting of Silver,Tin,
Mercury and most alloys today have some degree of Copper plus a few other
elements added for handling and long term properties.  As a solution – there
are complexes formed of Silver-Mercury (the stongest and most desireable),
Silver-tin, Silver-Copper, tin-Mercury (the weakest and most likely to
corrode), tin-copper … Well you get the idea.  The ratios of these complexes
continue to change for quite a long time (read – YEARS).  The greatest changes
occur in the first 24 hours.  The lighter colour of the Alloy is very normal.
It will change in time to match the others. (Older silver restorations did not
have the Copper in them and would corrode and turn almost black).
        The Mettallic taste can take a variable amount of time to go away,
 depending on many variables, not the least of which are:
        1) the ph of your saliva.
        2) the types of other restorations in your mount, especially ones that
           come in contact with the new one.
        3) the mineralization of your saliva. (remember that two dislike
           metals in a salt solution = a battery !)
        4) Your diet – (how acidic, how corrosive (eggs are very high in
           sulfides ((as well as cholesterol)))
        5) Your Oral Hygiene – (How well are you keeping that acid producing
           plaque off of those restorations?"

So you see, there is no simple answer to how long —  usually within 1 month
all taste alteration and galvanic reactions have disapeared.  Some people
reading this will have the other extreme of never having a mettalic taste after
an hour of leaving the dental office.  – Relax, it will go away
        S  o   o     n

– jrk

Chances are I may or may not have answered your question!