I was lucky enough to run into some orthodontic teeth sets C. 1940 that were in a dental school in Oregon. I thought I had seen most of the Columbia teeth sets over the last 18 years but these were a nice surprise. The study sets have an orthodontic procedure left as it was many years ago. The teeth are set in a firm wax that is attached to the aluminum gum holders. The brackets, wax, and metal make a great look for your older dental manikin. Typically I will pair these up with a phantom but since all but one head are around I am selling these for someone who is looking for an excellent set that is a unique working example from the period.