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These devices aren't to be confused with splints used to protect bruxors even though they may also fit that role.
The CPAP is more effective against sleep apnea than those dental appliances but makes noise, requires electricity, is a challenge to bring on trips and usually a lot less comfortable, wich is the problem adressed by the product advertised in the OP. The effectiveness of dental appliances is currently (in the latest studies) similar or even slightly better than that of CPAP because there is a lot more adherence to the treatment (lots of people can't go the whole night with their CPAP).
Whatever solution you go for you MUST NEVER USE AN OFF THE SHELF DENTAL APPLIANCE, those will give you SEVERE DENTAL PROBLEMS, there are lots of documented cases and FDA should never have approved those.