Thank you for your enquiry.
Here are 2 possible reasons for your crossbite returning:
1) Insufficient retainer wear, resulting in relapse of your original problem
2) Further growth of your jaw to the right as you grow older. The lower jaw stops growing at a later age than your upper jaw, which could have then caused your bottom teeth to move together with it. We do see this quite commonly in asymmetry cases (meaning the jaws are not in balance, uneven or slanted) , if your previous orthodontic treatment was done during the early adolescent years, and the patient subsequently experienced late lower jaw growth
If you are not in any discomfort, you are able to eat fine and you are not concerned about the look of the crossbite, you may choose to leave it. Of course a consultation with an orthodontist or dentist would be good so that we can discuss your treatment options with you, should you decide to want to treat it.
Thank you and all the best!
Warm regards,
Dr Geraldine Lee
