@smb3
I have been religious about my teeth since I was a kid. Never had cavaties. Decided to go for adult orthodontics in my early 20's (at the time the insurance company didn't pay for adult orthodontics). I had an orthodontist who didn't rush my teeth - I believe I was in braces nearly 3 years.
Then came root canals, teeth breaking off from the weakening of the root canals (I'm in my mid 50's). Seriously if I had known about veneers at the age of 20, I would have bypassed orthodontics and went straight to veneers.
I have to be honest. My missing teeth have been gone nearly a decade. I only asked for the partial because you don't know anything missing unless I really laugh hard. So for me, it's cosmetic. None of my teeth shifted from the missing teeth and yes I can even eat on that side of my mouth.
They wanted to implant an anchor tooth and then install a fixed partial that had two pontics (fake teeth). My mouth would then have implant, two fake teeth then real tooth (actually a crown).
I never ate with my retainer in my mouth. I wore a retainer for nearly a decade - I used to buy them at cost from the orthodontist :-)
Because this partial is filling in for 3 back teeth, two of which are molars, it feels weird for me to chew on that side. I'd rather eat without it - I'm more used to that.
There are times when you must speak, not because you are going to change the opposing side, but because if you do not speak, they have changed you.