If you've ever had braces as a kid and watched your teeth slowly drift back to crooked a few years later, there's a decent chance the real issue was never the teeth. It was the box they were sitting in. A narrow upper jaw simply doesn't leave enough room, no matter how many times you straighten what's inside it.
For a long time, adults were just told this couldn't be fixed. The suture down the middle of the palate fuses somewhere in the late teens, and older expanders — the kind that push against the teeth themselves — basically just tilt everything sideways on someone whose bone has already locked. It looks fine on an X-ray. It isn't actually widening anything.
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