It is a real, long-established clinical option, and it is one of the best-kept secrets in removable dentistry. Gold occlusal surfaces — the chewing surfaces of the back denture teeth — have been used for decades, precisely because they solve the problem that quietly ruins most dentures: wear.
Durability. Acrylic denture teeth flatten. It happens gradually, so people rarely notice it — they just find that chewing got harder and the denture “does not fit like it used to”. What actually happened is that the teeth wore down, the bite collapsed a few millimetres, and everything above it stopped lining up. Gold does not do this. It cannot crack, chip or shatter, and it barely wears, so the bite you were given is the bite you still have in ten years.
Biocompatibility. Gold is inert. It is among the most biologically compatible materials known to medicine, with no resin monomers, nothing leaching, and no chemistry to worry about — unlike acrylic and composite teeth, which are resins from the same family as white fillings. If you are going to have a material in your mouth 16 hours a day, this is the one to have.
And it is kind. Porcelain teeth also resist wear, but they are brutally hard: they grind down whatever they bite against — your remaining natural teeth, or the opposing denture — and they chip. Gold is close to enamel in hardness. It protects the denture without attacking anything else.
The trade is the colour, which is why it is used on the back teeth. Nobody sees them; they just do the work.