Only problem is the wire isn't THAT strong so it doesn't hold shape as well as the aluminum rod but considering how much thinner the wires are and the fact that the plastic coating prevents them from twisting or rusting makes them much more comfortable and durable than bare wires or aluminum rods. Aluminum rods become brittle after bending and they are VERY flexible in the washing machine. They work very well as archwire, they are strong and flexible enough to hold up well to washing.
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