They’re usually called “snore guards” or something like that. You boil them in water for five minutes and bite on them to mould them to your teeth. I have one,

They’re usually called “snore guards” or something like that. You boil them in water for five minutes and bite on them to mould them to your teeth. I have one, it works alright. It lives in my backpack for when I forget to pack my prescribed oral appliance.