In a recent post by Prof. Kevin O’Brien, the issue of a possible long term problems with bonded wire (fixed) retainers is examined. In the examples shown, it is suggested that the wire retainer has exerted an unfavourable force on one or more teeth possibly as a result of the wire unravelling, causing the tooth to move out of alignment.
The comments on this post are interesting to read with many suggesting this type of problem is extremely rare and may be caused by other reasons including deformation of the wire.
Fixed retainers remain a popular option with adult patients and I think it is unlikely that anything in this post would dissuade you from getting them but maybe consider having a discussion with your orthodontist to get their thoughts on this topic.
You can read the post here