You might be amazed to learn that there is a market for scrap dental work.
It's impossible for a patient to know (unless their dentist has told them) what the precious metal does the dental work contains.
For instance, there are a number of different gold alloys used in dentistry, all of which have a characteristic yellow coloration. Those alloys that can be used to make dental crowns can have a karat value ranging anywhere from around 10 to 22. At 10 karats, a piece of metal is 40% gold. At 20 karats the gold content is 80%
So how much gold is there in your old crown or dental bridge? As we said, it's impossible for you to know unless, your dentist told you. To give you an idea about the value of scrap dental restorations, let's take the case of a dental crown. An average full "gold" crown might weigh on the order of two to three grams. This is on the short side of about one-tenth of an ounce. Clearly any yellow gold colored dental restorations have the potential for having precious metal content.
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