ABSTRACT
If the appliance is uncomfortable the patient will have an excuse to take it out of the mouth. The appliance should be smooth, well polished, and have no protruding sharp wires.
The patient should be able to remove and insert the appliance easily. Keep the design simple; do not try to do too much with one appliance; limit the active components of the appliance to two finger springs. If the patient finds difficulty in inserting an appliance, either because it is too tight or there are too many active components, they will tend to leave it out.
