Silver fills are older technology. They expand and contract with changes in temperature during eating. Teeth do not like to expand and contract. They crack and break around the silver. Most important, old silver fillings leak and decay.
After
The upper photo shows reasonably decent looking silver fillings and the photo next to it shows how much decay was under the silver fillings. The bottom most photo shows the completed restoration. Most old silver fillings are leaking and decaying.
