Doesn't matter if all your fillings are made of silver/gold/mercury/amalgum or glue, they've not caused scars on your brain, nor will they disappear by changing all your fillings.
It's a desperation move that only makes your dentist richer.

Thats a difficult one,lots of evidence for and against amalgam fillings but generally judged as faster,cheaper,harder wearing and longer lasting.

I had all the silver fillings slowly replaced with porcelain. Don’t know if it helped but felt it was worth trying.

According to the US FDA "Dental amalgam contains elemental mercury. It releases low levels of mercury in the form of a vapor that can be inhaled and absorbed by the lungs. High levels of mercury vapor exposure are associated with adverse effects in the brain and the kidneys." I tend to be low risk, so I had all my fillings swapped for gold or ceramic when they came due for replacement and paid the difference. [Some fillings are too large for ceramic.] Any new filling gets ceramic or gold. My thought is that I already have a problem and there is no sense taking a chance that something that might not bother someone else is a problem for me. But it is still on the market, so clearly the FDA thinks the benefits outweigh the risk. The problem is when you happen to be in the risk pool. Good luck. Maybe ask your MS doctor (or nurse) what they think.

Ask you Neurologist, this is something I have no clue about.