There are cases where part of the effect of orthodontic treatment is lost over time. The reasons for this can include the patient’s growth, a change in eating habits (switching from soft to hard food), or insufficient or poorly planned retention of the teeth. Retreatment is possible after the patient’s case has been assessed. It is important to check on an X-ray whether the first round of tooth movement has left any consequences (shortened roots, active periodontal disease). If the teeth have already been affected by previous treatment, we may advise you not to start a new one.
This answer is for general information. Your own case needs an examination by an orthodontist.