notesonly.in

Braces come off with perfect alignment, but a year later the lower front teeth crowd again. Why? Relapse — the stretched periodontal and gingival fibres pull teeth toward their old positions, and late jaw growth plus tongue/lip pressures add drift. This is why retention isn't optional: a retainer (removable or fixed lingual wire) holds teeth while fibres remodel over months. Students learn the sobering rule: teeth move for life, so retention is for life (at least nights).