Dental gold is usually alloyed with other precious metals from the platinum group to make it more durable, this is one reason why it sells for so much on
ebay.
If you decide to melt the tooth you'll regret doing so, the metals alloyed with the gold react like the cream in milk that rises to the top. The alloys seperate and you loose the luster of your gold, my suggestion is to leave it as is.
Melting gold in an induction furnace is about the only furnace known to stir the alloys while melting, otherwise you have to use a carbon rod to stir the molten metals to keep them homogenized. It's not than easy.
Once the metals separate during the melt you'll never get a good XRF reading from the nugget, you will have rendered you precious gold into a worthless lump.
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