There are many dental appliances on the market to treat OSA or Obstructive Sleep Apnea. (apnea = without breathing) All work by holding the lower jaw open and slightly forward, keeping the airway open. The relative position of body parts affects the airway, think CPR. The appliances are prone to breakage because the materials may not hold up to the parafunction of some very powerful muscles. That depends on the individuals involuntary habits, more so in some than others. If that turns out to be the situation for you, get a 2nd appliance as a spare for when you travel.
Medical insurance coverage usually requires both pre and post sleep monitoring in a sleep lab, which is a good idea even without the insurance requirement. There are altenative and more permanent treatments that involve altering the soft palate and lateral throat form.
What works for one, does not work for all. A "sleep specialist", should be part of the treatment team. Although "sleep" is not a recognized "specialty" there are health professionals who have obtained additional training and focus their practice on sleep disorders.
Did your dental professional also provide one of the daytime appliances shown on the site for the device? Separate appliances for day and night is an interesting concept.
This generation is more obese than any other in the history of mankind. If one falls into that category and has OSA, simply losing weight
may be the answer for some with the condition. Keeping one's weight
in the "normal" range would help with a lot of other medical conditions as well. Prevalence does not mean normal.