Unexpected complications of long-term fixed retainers: A case series.

Long-term bonded retainers caused severe incisor root movement and bone loss in two patients; both were successfully retreated using customised orthodontic appliances to reposition teeth and resolve gingival recession.

A plain-English summary of the study's own findings — we don't add our own claims or interpretation. Read the full paper for the complete methods and results, and apply your own clinical judgement.