Scootering is an extreme sport that comes with risks of getting injured. You can either learn to fall correctly or go out and get yourself a full padded suit to protect your weak body from falls and scrapes. As you can imagine seeing someone ride a scooter with a full padded suit would look pretty ridicules. That's how I feel people look when using mouth guards. It's an unnecessary precaution that I feel people don't need to take and there are other ways to protect your teeth. But aside from that I don't think you shouldn't use a mouth guard in sports like hockey or football where the point of the game is literally to hit each other. Then yes you wear a full padded suit and a mouth guard and you won't look ridicules.
weak body? lol. I knocked my teeth out flying sideways on a quad (face of jump was muddy and slid out on take of) over an 80 foot double at around 40mph and I had the option to bail and have my quad roll over me while I'm already on the ground and risk breaking my back, paralysis, or worse-or I could hang on and throw my body to the inside and hope for the best. I hung on and no-one knows how I kept from flipping. Strength has nothing to do with it. I had two options in this situation and the one I chose took out my teeth which was probably the safest option/result.
"Falling correctly" meant nothing in this situation and who's to say you know every possible scenario that could happen on a scooter?
It is not common for people to wear mouth guards in motocross races but would it have saved my teeth? Yes
I understand that use of mouth guards will look ridiculous. Other than looking weird how does a mouth guard hinder you? It doesn't.
Just as scootering is seen as a child's sport by many due to what our culture deems is socially acceptable-mouth guards are not socially acceptable where they could be used due to these same reasons. Your opposition to mouth guards is ultimately sourced from the same reason adult scooter riders catch flack-that is, Social Acceptance.