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Your orthodontist's choice of retainer for you will depend on how much your teeth move, how much 'memory' they have, and how much expansion of your arches you had during treatment.
Fixed bonded retainers tend to be used for patients whose teeth have a lot of 'memory', i.e. show a tendency to move back towards their starting positions, or if teeth were de-rotated. If your teeth have a strong tendency to revert back to where they started, even a dilligently-worn removable retainer will struggle to hold the teeth in place. Essix retainers have become very popular but are not such a good choice for patients who had a lot of expansion, or where settling or final 'tweaking' of the teeth after the braces come off are required.
Sure, you can express a preference, but your orthodontist wouldn't push for a fixed retainer unless they felt you really needed it. I think ultimately you have to trust your ortho.
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