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Underbite and open bite are two of the bite issues most prone to relapse after orthodontic treatment, and if either has started returning after a period of inconsistent retainer wear, it's worth understanding what your retainer can and can't do about it at this stage.
Underbite Relapse: What to Know
An underbite, where the lower front teeth sit in front of the upper front teeth, can relapse if retainer wear lapses, particularly since vertical and horizontal bite relationships are sensitive to even small amounts of tooth movement. Depending on whether your original case was primarily dental or had a skeletal component, relapse can range from barely noticeable to a clear return of the original bite pattern.
Open Bite Relapse: What to Know
Open bite is one of the more relapse-prone bite types generally, particularly if a tongue thrust habit contributed to the original case and was never fully resolved. Even with good retainer habits, some people find open bite is more likely to shift back over time compared to other bite types, which is part of why consistent long-term wear tends to be emphasised more heavily for open bite cases.
Can a Retainer Fix Either Once Relapsed?
A standard retainer is built to hold your teeth in a fixed position, not to actively move them back into a new one. If relapse is minor and caught early, resuming consistent wear can sometimes stabilise the position and prevent it from progressing further. Once relapse has advanced to the point where your retainer no longer fits comfortably or the bite has visibly shifted, a standard retainer generally cannot reverse it, since it was moulded to a position your teeth are no longer in.
What to Do Next
If your retainer still fits well and you've simply been inconsistent with wear, resuming regular use as instructed is a reasonable first step. If it no longer fits properly, or the shift is clearly noticeable when you look in the mirror or bite down, that's the point to get a dental professional assessment rather than continuing to force a retainer that no longer matches your current bite. Depending on severity, a shorter course of aligners is sometimes enough to correct moderate relapse without needing a full second treatment.
Frequently Asked Questions
Is open bite more likely to relapse than other bite types?
Many practitioners consider open bite among the more relapse-prone bite corrections, particularly when a tongue thrust habit was part of the original cause and hasn't been fully addressed.
Can I tell how much relapse has happened just by how my retainer feels?
To some extent, yes. A retainer that no longer fits comfortably or feels noticeably different is a reasonable signal that meaningful movement has occurred, though a proper assessment gives a clearer picture.
Do I need a full second round of treatment if my bite relapses?
Not necessarily. Depending on the degree of relapse, a shorter, more limited course of aligners can sometimes correct it without needing the same length of treatment as your original case.
Will wearing my retainer more often reverse relapse that's already happened?
Generally no. A standard retainer holds position rather than moving teeth, so increased wear helps prevent further relapse but typically won't reverse movement that has already occurred.
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