This orthodontic device is used for practice before they work on your mouth. This mold is quite difficult to find because older practice molds of this type and age have been long lost. This one is especially unique because they used gold to practice different filling scenarios. Usually I see these sell for the gold value, but I think they hold higher aesthetic value. I am glad that I got one in stock that has not been melted down for gold scrap. This particular set matches well with the manikin head (that I had featured a while back). Both are from the same period and would make a remarkable object.