Im wearing Qaud helix expander for 3 months now on my upper Jaw , I would say that it was quit hard for me to adjust specially for the first 6 weeks . I hated the expander , and hated to talk
My tongue was sore at the beginning specially when I wake up , I tend to push the expander with my tongue while sleeping and used to wake up every while because of the sourness I felt on my tongue.
With time it gets better and better . Speaking is totally back to normal ; my lisp continuos until the week #7 or 8 ! Trying to speak slowly helped me so much.
I think it was hard for people on the phone to understand me at that time it was so funny the way I spell some letters.
You will be able to adjust your tongue movement while eating and speaking just don't worry it's not that bad , I expected it to be too way worse than it is .
Now I just can't feel it's there anymore while I'm eating , foods get stuck there some times though , but cleaning is not hard. I used to ask my ortho when to remove it but after the second month I just starting not to care about it
Good luck , let us know if you need to know anything else .