Advantages of Cast Gold Restorations:

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Gold is strong, but forgiving:

Fragile areas of your natural tooth structure can be covered with gold to prevent fracture.  The gold itself will remain intact.

Defective silver filling, with a fracture

Gold is permanent:

Unlike some other types of restorations, gold does not wear away. You don't have to worry about it fracturing or chipping. In fact, a good gold restoration often lasts a lifetime.

There was a cavity on the back of the tooth extending to the root.

Gold is Natural:

Gold will not oxidize, or turn greenish gray, like many amalgam (sliver) fillings.  It does not stain surrounding teeth.  It complements the natural colors of teeth and tissues found in your mouth.  A well done gold restoration is truly beautiful.

Silver filling with a fracture on the back.

Same Filling, last tooth on the right.

Gold is pliable:  

It allows a dental technician and dentist to form a restoration that complements the natural form of you tooth. That's important because your natural bite plane remains intact, which reduces the chance of discomfort or fractured restorations.

Defective silver filling

Gold contributes to better health:

The margin, or area where the gold meets the natural tooth structure, is nearly imperceptible if handled properly.  that means that there's less chance of debris accumulating at or under the margin, which may result in tooth decay. 

Defective White fillings.

Gold is hygienic:

Because gold polishes so well, it results in a very smooth surface.  Restorations with a smooth surface are less likely to harbor plaque and other debris.

Gold is versatile:

When we speak of a "gold" restoration, we really mean gold alloy.  An alloy is a combination of different metals.  the dentist can chose from any number of alloys that offer the right properties for each patient.

Gold expands and contracts, just like your teeth do:

Some restorations, like amalgam, may expand more than the tooth resulting in tiny fractures or cracks.  That's not an issue with gold, as its expansion and contraction is similar to that of a tooth.