I made a stock mouthguard because people in space might grind their teeth too much. It is not good to grind your teeth. Every time an astronaut grinds their teeth they can just pop the mouthguard right in their mouths so they stop grinding. In space for three years you need to have good and healthy teeth and this will help. So when you come back from space you don’t have to go to the dentist right away. That is why you should have a mouthguard in space.