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So far as the operation itself, I've come to understand that the angle they go in from is much different - typically from within the mouth using a small incision on each side, snipping connective tissue atthe back of each gland and then at the duct in its front, clearing the duct to speed up residue depletion, then closing each wound, thus keeping the animal's teeth intact -
whereas they used to cut in from the sides of the head. Also, that this new method used to be done under cold torpor, though I've come to understand they have developed safer tranquilization methods since then.
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