Hi, my soon 12 yo girl just got her Twin Blocks and is super cool with them. First few days there was some pain and dripping, but several days after everything got settled, she started to eat with them too.
She wears them all the time, at school also. She speaks as she has a full mouth, but then again: she does - of twin blocks! :) But she has no problems with that at all. She's confident with them, girlfriends support her, boys didn't even notice or when they do, they are interested in them as in technical equipment. :) There are quite some pupils with some sort of braces, so this is normal for their social circle.
She takes them out at sports. She's so confident, she takes them out in the middle of the street, not carring if someone find's that strange. She licks them and then adjustst them back.
Keep in mind she's in puberty, fully self-oriented. 
We did prepare for the time, she'd got braces: when she started to see an orthodontist, she started to read comics Smile from Raina Telgemeier and I think that really helped her with accepting braces as something normal for childhood.
Also: I never pitied her, I am of maximum support and coaching her through discomfort with high-fifs sort of attitude. Noone in our family makes fun of that and most people are saying, that they are really looking cool. Especially as she hass chosen blue ones with sparkles. :)
So: be supporting and with joyful attitude and keep wearing them!