This isn't skydiving but it kind of mimics that a little bit but you don't fly around with your mouth open so I wouldn't worry about it
This isn't skydiving, it's an indoor facility where you can "float" on a column of air generated by a giant fan. It's much gentler and very safe and allows you to develop control maneuvers for the real thing. I would say your dentures would be fine here... If you do make a tandem jump from a plane though, I'd take them out.
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