A friend had jaw surgery last December. She is a very good masters swimmer, and spent a couple of weeks not doing flip turns because of it - the pressure on her head was the issue maybe, or the speed/impact from pushing off the wall - so you might be careful with those.

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maybe she's born with it, maybe it's chlorine
If you're injured and need some sympathy, PM me and I'm very happy to write back.
disclaimer: PhD not MD