Not wearing retainer before and after
A retainer keeps teeth in their corrected positions; stopping it can allow gradual tooth movement and bite changes.
The short answer
A retainer keeps teeth in their corrected positions, and stopping it can allow gradual tooth movement and bite changes.

What is the direct answer?
What does this question mean?
Before-and-after retainer changes usually refer to teeth becoming crowded, rotated, spaced, or harder to fit into the retainer. The periodontal ligament and surrounding bone adapt to tooth position, while pressure from the lips, cheeks, tongue, and bite can influence movement.
What can you do next?
Keep the retainer clean and bring it to an orthodontic appointment rather than forcing it over a painful or severely displaced tooth. The orthodontist may check the fit, examine the bite, take photographs or scans, and recommend a replacement retainer or a short alignment course.
When should you seek dental care?
Arrange an orthodontic assessment when the retainer no longer seats, tooth movement is visible, or the bite feels different. Seek prompt care for facial swelling, severe pain, trauma, or a loose tooth, because those findings need an examination beyond retainer management.
What should you ask the dentist?
Ask whether the teeth have moved, whether the current retainer can be adjusted, and whether a new scan is needed. Also ask which retention schedule fits your corrected bite and how the retainer should be cleaned and stored.
Frequently asked questions
Can teeth move after orthodontic treatment?
Yes. Teeth can shift when a retainer is not worn as prescribed, so the orthodontist should assess any change in fit or bite.
Can I restart my old retainer?
Use it only as directed by the orthodontist, especially if it feels tight, painful, cracked, or cannot seat fully.
