Brackets for orthodontics. Connecting the arch-wire on bracket with wire. The wire is then put "down" behind the arch-wire and can also be covered with wax if irritating in the beginning. Note the bracket with extra knob, mounted with elastic ligament, that can be connected to the other jaw with elastic band to draw tooth inwards. The photo was taken the 23rd December 2005 by Håkan Svensson (Xauxa).
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No machine-readable source provided. Own work assumed (based on copyright claims).