Where are you getting an oral appliance?
I have one, it works alright. It lives in my backpack for when I forget to pack my prescribed oral appliance.
> Some of the samples tested by the Zero Mercury Working Group contained as much as 65,000 ppm of mercury – an astounding 65,000 times the legal limit of 1 ppm set by the Food and Drug Administration.
https://www.ewg.org/news-insights/news-release/2022/03/dange...
> Amazon Japan K.K. and the two companies in Gifu and Saitama prefectures sold key chains and compasses containing tritium, a radioactive isotope of hydrogen, without reporting it to the NRA, in violation of the radiation hazard prevention law, the NRA said.
https://www.japantimes.co.jp/news/2017/09/20/business/nuclea...