Its not just mouth guards that can cause jaw alignment issues!
I had been using a FFM for almost 8 months and I noticed that my bite was changing, I was also having my jaw "catch" and snap , .
The FFM applies pressure on my jaw pushing it back; In addition to the bite issues, I also was haveing more Obstructive events because when my jaw is further back, my airway closes up easier.
I tried two different mouth guards for 3 weeks all the while monitoring my SP02 levels thru the night.
They difinately helped, with my Sleep Apnea ( SP02 was not as good as the FFM) but they too altered my jaw alignment.
On my own, I just bought a Nasal mask, and it works better than either of the two previous options. all without the jaw alignment issues , SP02 levels good as well.
Another benifit with my new Nasal mask , is that I do not have an issue with bloating now.
I wonder why my sleep doctor never considered a nasal mask?
In any case, ........... like with medications, many devices that are designed to help us ......... have unintended consequences
So, like previously stated, I guess each person has to weigh in the benifits against the side effects and make decisions as to what works for them.
Doctors are a tool too; they can offer ideas and options, but not all of their solutions will work for everyone; Ultimately we are responsible for our journey thru life.
The good thing is that there are many options out there, none perfect, but at least we have options to help us live better.