In conversations with my dentist, it has become clear that perhaps the biggest problem they have with patients is compliance in how many hours in a day the appliance is worn.
Apparently, some patients think they can wear the appliance for fewer hours per day than recommended (sometimes many fewer) but then they are disappointed that progress is slow or nonexistent.
I suppose that for patients like myself who work hard to earn a modest living then must take that money out of their pocket and hand it to the dentist, we are very motivated to cooperate fully in order to "get our money's worth" from what we have struggled to pay for.
But perhaps others (like children) who did not really work to earn that money, or perhaps those who have such work covered by insurance or paid for by others, are not so motivated. Perhaps they see it more as an annoyance. So you parents out there who are perhaps reading this blog because you are getting this type of work done on your children- you need to stay on top of it. If your child is asked to wear the appliance X hours/per day, see to it they do. If the patient cheats it will retard or even prevent progress.
As inconvenient as these appliances might seem to a child, if they were to experience the braces I had as a child, with the bands on the teeth, the cement, the monthly torture/adjustment sessions that remained painful for 2 weeks, the painful rubber bands, they would know that no-pain DNA Appliance epigenetic orthodontics is a blessing and a breeze in comparison. This is an age of miracles and wonders. Of course they are children, so they don't know that. So use your parental wiles to deal with it accordingly.