I lost my mouthguard and this guy comes up to me apologising thinking it was his mouthguard and gave it back to me. He did have it in his mouth so I'm thinking of just getting a new one
I guess u could sterilise it in boiling water but it'll lose it's shape I'd buy a new one, would you let someone use your toothbrush?
That's super nasty. Get a new one. You could pick up all kids of **** from someones saliva. Great time to get your dentist to make you a custom one. Not that expensive, better fit and protection.