Why don’t they just stay put? Or maybe a retainer for a couple years and then they decide that’s their new place?
In: Biology
There are gingival fibers in your mouth that try to pull your teeth into place. For all they know, the teeth being out of place is *wrong*, so the fibers will try to pull them back. In cases where the fibers are likely to pull your teeth back out of place, your orthodontist can perform a [fiberotomy](https://en.m.wikipedia.org/wiki/Fiberotomy) to sever the gingival fibers and keep them from pulling on your teeth.
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