I didn't get a gap in my teeth because I didn't have the SARPE surgery to open up my palate, and my mid-palatal suture has not broken. If you have the surgery, then you can expand "rapidly", which causes the gap, usually between the front two teeth (although from what I've seen, this closes itself rather quickly once the expansion process is over). There have been occasions, just after its turned, when my two front teeth seem to open up just very slightly, but then, the next day its gone. I believe with SARPE you can fully expand within a matter of weeks, but I think I'll have this in for well over a year (although, I think I will get to trade it up for a larger model later this year
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If you're not having the surgery, from what I gather, it will be highly unlikely you will get the huge gap in your front teeth. I'd love to know more about how your ortho is planning your "expansion", and whether they're using a similar appliance to what I have. From what I gather, its quite unusual for ortho's to use RPE's in adults without SARPE...
My expander really hasn't bothered me in the slightest, it took a few days to get used to it - some drooling (okays, lots of drooling on the first day - I think my body was trying to digest the expander or something
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Good luck, and I'd love to see some photos of your appliance (and progress) once you have it fitted!
![Very Happy :D](./images/smilies/icon_biggrin.gif)