The evidence regarding wisdom teeth and crowding of the lower incisors demonstrates between groups that have wisdom teeth that are present, absent or impacted. Hence it is unusual to recommend the extraction of the wisdom teeth purely for maintaining straight lower teeth, and certain the extraction of the wisdom teeth will not alter the mobility of the lower incisors.
The mobility of the lower incisor is not unexpected after the reinsertion of the retainer. The mobility is simply due to the supporting tissues of the tooth adapting to the difference forces that have been applied to the tooth. Once these forces reduce back to a normal level then the tooth with return to it’s normal mobility. If your daughter finds that the tooth continues to be more mobile (assuming that the tooth is healthy) then there is likely to be a bite issue with the tooth and you need to see your orthodontist to check that the bite is satisfactory.
I would strongly suggest that while the tongue and the swallowing pattern can be responsible for movement of the lower teeth, this is only one factor of many that cause movement of the lower incisors. There is little evidence that a myofunctional appliance can change the muscular forces especially in a late adolescent individual.
My recommendation is discuss the movement with your orthodontist and if you are uncomfortable with their response then get a second opinion from another specialist orthodontist.
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