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They're for elastics when I get my bottom braces on, and yeah, I feel them. LOL. The molar bands, esp the left one (which is all covered in wax now which helps a TON) are the only things that have truly hurt me though.
In fact other than that, they feel pretty good. When I told that to my best friend, she was like "see why I sometimes miss mine?" LOL
It is a tube for headgear. It's just part of all the bands my ortho uses (they're pre-assembled things). I'm not going to need headgear, they just said that way they have everything just in case (kinda a good luck thing - if it's not on your bands, then you'll need it LOL).